diff --git a/maps/tampere_10x10km_1024px.png b/maps/tampere_10x10km_1024px.png
new file mode 100644
index 0000000..8176c88
Binary files /dev/null and b/maps/tampere_10x10km_1024px.png differ
diff --git a/maps/tampere_10x10km_1024px.png.import b/maps/tampere_10x10km_1024px.png.import
new file mode 100644
index 0000000..bd32059
--- /dev/null
+++ b/maps/tampere_10x10km_1024px.png.import
@@ -0,0 +1,14 @@
+[remap]
+
+importer="image"
+type="Image"
+uid="uid://dprlyk4ednkp8"
+path="res://.godot/imported/tampere_10x10km_1024px.png-569f3285557c876bd7277d49b8414424.image"
+
+[deps]
+
+source_file="res://maps/tampere_10x10km_1024px.png"
+dest_files=["res://.godot/imported/tampere_10x10km_1024px.png-569f3285557c876bd7277d49b8414424.image"]
+
+[params]
+
diff --git a/maps/tampere_10x10km_4096px.png b/maps/tampere_10x10km_4096px.png
new file mode 100644
index 0000000..1488a1b
Binary files /dev/null and b/maps/tampere_10x10km_4096px.png differ
diff --git a/maps/tampere_10x10km_4096px.png.import b/maps/tampere_10x10km_4096px.png.import
new file mode 100644
index 0000000..7dc78c6
--- /dev/null
+++ b/maps/tampere_10x10km_4096px.png.import
@@ -0,0 +1,14 @@
+[remap]
+
+importer="image"
+type="Image"
+uid="uid://bl4xbe4vb3nft"
+path="res://.godot/imported/tampere_10x10km_4096px.png-a656fcf9b79fbe6e529e735982b88a37.image"
+
+[deps]
+
+source_file="res://maps/tampere_10x10km_4096px.png"
+dest_files=["res://.godot/imported/tampere_10x10km_4096px.png-a656fcf9b79fbe6e529e735982b88a37.image"]
+
+[params]
+
diff --git a/project.godot b/project.godot
index ab7ce6c..5f5dd92 100644
--- a/project.godot
+++ b/project.godot
@@ -19,6 +19,10 @@ config/icon="res://icon.svg"
 
 Globals="*res://scripts/Globals.gd"
 
+[debug]
+
+gdscript/warnings/integer_division=0
+
 [display]
 
 window/size/viewport_height=1080
diff --git a/scenes/Main.tscn b/scenes/Main.tscn
index acab0fd..8dd1ab3 100644
--- a/scenes/Main.tscn
+++ b/scenes/Main.tscn
@@ -1,1472 +1,25 @@
-[gd_scene load_steps=12 format=3 uid="uid://ciperl36hv26g"]
+[gd_scene load_steps=6 format=3 uid="uid://ciperl36hv26g"]
 
 [ext_resource type="Script" path="res://scripts/Main.gd" id="1_ysxum"]
-[ext_resource type="Texture2D" uid="uid://byy4k72uxx7sj" path="res://art/buildings/residential/med/med20x20res001.png" id="2_sfv1p"]
+[ext_resource type="Script" path="res://scripts/TileMapGenerator.gd" id="2_cbjcm"]
 [ext_resource type="Script" path="res://scripts/Control.gd" id="3_1t1c8"]
-[ext_resource type="Script" path="res://scripts/World.gd" id="3_6q5ju"]
-[ext_resource type="Texture2D" uid="uid://dakvtfpnjuwwl" path="res://art/placeholder/outdoors.png" id="3_yddbk"]
 [ext_resource type="PackedScene" uid="uid://2we3txfr812u" path="res://scenes/Camera_zoom_2d.tscn" id="4_rx82t"]
-[ext_resource type="Texture2D" uid="uid://djy5ne2grdc03" path="res://art/terrain/terrain.png" id="5_bqev6"]
-
-[sub_resource type="TileSetAtlasSource" id="TileSetAtlasSource_3q7ue"]
-texture = ExtResource("2_sfv1p")
-0:0/size_in_atlas = Vector2i(20, 20)
-0:0/next_alternative_id = 2
-0:0/0 = 0
-
-[sub_resource type="TileSetAtlasSource" id="TileSetAtlasSource_s55i2"]
-texture = ExtResource("3_yddbk")
-0:0/0 = 0
-1:0/0 = 0
-2:0/0 = 0
-3:0/0 = 0
-8:0/0 = 0
-9:0/0 = 0
-10:0/0 = 0
-14:0/0 = 0
-15:0/0 = 0
-16:0/0 = 0
-17:0/0 = 0
-20:0/0 = 0
-21:0/0 = 0
-22:0/0 = 0
-23:0/0 = 0
-24:0/0 = 0
-25:0/0 = 0
-26:0/0 = 0
-27:0/0 = 0
-0:1/0 = 0
-1:1/0 = 0
-2:1/0 = 0
-3:1/0 = 0
-8:1/0 = 0
-9:1/0 = 0
-10:1/0 = 0
-14:1/0 = 0
-15:1/0 = 0
-16:1/0 = 0
-17:1/0 = 0
-21:1/0 = 0
-23:1/0 = 0
-25:1/0 = 0
-27:1/0 = 0
-28:1/0 = 0
-0:2/0 = 0
-1:2/0 = 0
-2:2/0 = 0
-3:2/0 = 0
-8:2/0 = 0
-9:2/0 = 0
-10:2/0 = 0
-11:2/0 = 0
-12:2/0 = 0
-13:2/0 = 0
-18:2/0 = 0
-19:2/0 = 0
-21:2/0 = 0
-22:2/0 = 0
-23:2/0 = 0
-24:2/0 = 0
-25:2/0 = 0
-27:2/0 = 0
-28:2/0 = 0
-0:3/0 = 0
-1:3/0 = 0
-2:3/0 = 0
-3:3/0 = 0
-8:3/0 = 0
-9:3/0 = 0
-10:3/0 = 0
-11:3/0 = 0
-12:3/0 = 0
-13:3/0 = 0
-18:3/0 = 0
-19:3/0 = 0
-21:3/0 = 0
-23:3/0 = 0
-25:3/0 = 0
-0:4/0 = 0
-1:4/0 = 0
-2:4/0 = 0
-3:4/0 = 0
-8:4/0 = 0
-9:4/0 = 0
-10:4/0 = 0
-11:4/0 = 0
-12:4/0 = 0
-13:4/0 = 0
-18:4/0 = 0
-19:4/0 = 0
-20:4/0 = 0
-21:4/0 = 0
-22:4/0 = 0
-23:4/0 = 0
-24:4/0 = 0
-25:4/0 = 0
-26:4/0 = 0
-27:4/0 = 0
-28:4/0 = 0
-0:5/0 = 0
-1:5/0 = 0
-2:5/0 = 0
-3:5/0 = 0
-8:5/0 = 0
-9:5/0 = 0
-10:5/0 = 0
-11:5/0 = 0
-12:5/0 = 0
-13:5/0 = 0
-18:5/0 = 0
-19:5/0 = 0
-20:5/0 = 0
-21:5/0 = 0
-22:5/0 = 0
-23:5/0 = 0
-24:5/0 = 0
-25:5/0 = 0
-26:5/0 = 0
-27:5/0 = 0
-28:5/0 = 0
-0:6/0 = 0
-1:6/0 = 0
-2:6/0 = 0
-3:6/0 = 0
-8:6/0 = 0
-9:6/0 = 0
-10:6/0 = 0
-11:6/0 = 0
-14:6/0 = 0
-15:6/0 = 0
-16:6/0 = 0
-17:6/0 = 0
-20:6/0 = 0
-21:6/0 = 0
-22:6/0 = 0
-23:6/0 = 0
-24:6/0 = 0
-25:6/0 = 0
-27:6/0 = 0
-28:6/0 = 0
-0:7/0 = 0
-1:7/0 = 0
-2:7/0 = 0
-3:7/0 = 0
-8:7/0 = 0
-9:7/0 = 0
-10:7/0 = 0
-11:7/0 = 0
-14:7/0 = 0
-15:7/0 = 0
-16:7/0 = 0
-17:7/0 = 0
-20:7/0 = 0
-21:7/0 = 0
-24:7/0 = 0
-25:7/0 = 0
-26:7/0 = 0
-27:7/0 = 0
-0:8/0 = 0
-1:8/0 = 0
-2:8/0 = 0
-3:8/0 = 0
-8:8/0 = 0
-9:8/0 = 0
-10:8/0 = 0
-11:8/0 = 0
-12:8/0 = 0
-13:8/0 = 0
-14:8/0 = 0
-15:8/0 = 0
-16:8/0 = 0
-17:8/0 = 0
-18:8/0 = 0
-19:8/0 = 0
-20:8/0 = 0
-21:8/0 = 0
-22:8/0 = 0
-23:8/0 = 0
-24:8/0 = 0
-25:8/0 = 0
-26:8/0 = 0
-27:8/0 = 0
-0:9/0 = 0
-1:9/0 = 0
-2:9/0 = 0
-3:9/0 = 0
-8:9/0 = 0
-9:9/0 = 0
-10:9/0 = 0
-11:9/0 = 0
-12:9/0 = 0
-13:9/0 = 0
-14:9/0 = 0
-15:9/0 = 0
-16:9/0 = 0
-17:9/0 = 0
-18:9/0 = 0
-19:9/0 = 0
-22:9/0 = 0
-23:9/0 = 0
-26:9/0 = 0
-27:9/0 = 0
-0:10/0 = 0
-1:10/0 = 0
-2:10/0 = 0
-3:10/0 = 0
-8:10/0 = 0
-9:10/0 = 0
-10:10/0 = 0
-12:10/0 = 0
-13:10/0 = 0
-14:10/0 = 0
-15:10/0 = 0
-16:10/0 = 0
-17:10/0 = 0
-18:10/0 = 0
-19:10/0 = 0
-22:10/0 = 0
-23:10/0 = 0
-26:10/0 = 0
-27:10/0 = 0
-0:11/0 = 0
-8:11/0 = 0
-9:11/0 = 0
-10:11/0 = 0
-12:11/0 = 0
-13:11/0 = 0
-14:11/0 = 0
-15:11/0 = 0
-16:11/0 = 0
-17:11/0 = 0
-18:11/0 = 0
-19:11/0 = 0
-20:11/0 = 0
-21:11/0 = 0
-22:11/0 = 0
-23:11/0 = 0
-24:11/0 = 0
-25:11/0 = 0
-26:11/0 = 0
-0:12/0 = 0
-8:12/0 = 0
-9:12/0 = 0
-10:12/0 = 0
-11:12/0 = 0
-12:12/0 = 0
-13:12/0 = 0
-14:12/0 = 0
-15:12/0 = 0
-16:12/0 = 0
-17:12/0 = 0
-18:12/0 = 0
-19:12/0 = 0
-21:12/0 = 0
-22:12/0 = 0
-24:12/0 = 0
-25:12/0 = 0
-26:12/0 = 0
-0:13/0 = 0
-8:13/0 = 0
-9:13/0 = 0
-10:13/0 = 0
-11:13/0 = 0
-12:13/0 = 0
-13:13/0 = 0
-14:13/0 = 0
-15:13/0 = 0
-16:13/0 = 0
-17:13/0 = 0
-18:13/0 = 0
-19:13/0 = 0
-21:13/0 = 0
-22:13/0 = 0
-24:13/0 = 0
-25:13/0 = 0
-26:13/0 = 0
-0:14/0 = 0
-8:14/0 = 0
-9:14/0 = 0
-10:14/0 = 0
-11:14/0 = 0
-12:14/0 = 0
-13:14/0 = 0
-14:14/0 = 0
-15:14/0 = 0
-16:14/0 = 0
-17:14/0 = 0
-18:14/0 = 0
-19:14/0 = 0
-24:14/0 = 0
-10:15/0 = 0
-11:15/0 = 0
-12:15/0 = 0
-13:15/0 = 0
-14:15/0 = 0
-15:15/0 = 0
-16:15/0 = 0
-17:15/0 = 0
-18:15/0 = 0
-19:15/0 = 0
-21:15/0 = 0
-22:15/0 = 0
-23:15/0 = 0
-24:15/0 = 0
-25:15/0 = 0
-26:15/0 = 0
-27:15/0 = 0
-28:15/0 = 0
-21:16/0 = 0
-22:16/0 = 0
-23:16/0 = 0
-24:16/0 = 0
-25:16/0 = 0
-26:16/0 = 0
-27:16/0 = 0
-28:16/0 = 0
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-25:17/0 = 0
-26:17/0 = 0
-27:17/0 = 0
-28:17/0 = 0
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-11:18/0 = 0
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-22:18/0 = 0
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-26:18/0 = 0
-27:18/0 = 0
-28:18/0 = 0
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-25:19/0 = 0
-26:19/0 = 0
-27:19/0 = 0
-28:19/0 = 0
-8:20/0 = 0
-9:20/0 = 0
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-11:20/0 = 0
-21:20/0 = 0
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-26:20/0 = 0
-27:20/0 = 0
-28:20/0 = 0
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-10:21/0 = 0
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-28:21/0 = 0
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-7:0/size_in_atlas = Vector2i(1, 3)
-7:0/0 = 0
-7:3/0 = 0
-4:3/size_in_atlas = Vector2i(3, 1)
-4:3/0 = 0
-4:0/size_in_atlas = Vector2i(3, 3)
-4:0/0 = 0
-13:18/size_in_atlas = Vector2i(2, 5)
-13:18/0 = 0
-12:20/size_in_atlas = Vector2i(1, 3)
-12:20/0 = 0
-15:20/size_in_atlas = Vector2i(1, 3)
-15:20/0 = 0
-4:24/size_in_atlas = Vector2i(3, 3)
-4:24/0 = 0
-4:27/size_in_atlas = Vector2i(3, 1)
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-7:24/0 = 0
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-7:12/size_in_atlas = Vector2i(1, 3)
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-4:4/size_in_atlas = Vector2i(3, 3)
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-7:4/size_in_atlas = Vector2i(1, 3)
-7:4/0 = 0
-7:7/0 = 0
-4:7/size_in_atlas = Vector2i(3, 1)
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-4:11/size_in_atlas = Vector2i(3, 1)
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-
-[sub_resource type="TileSetAtlasSource" id="TileSetAtlasSource_hwjm3"]
-texture = ExtResource("5_bqev6")
-0:0/next_alternative_id = 4
-0:0/0 = 0
-0:0/1 = 1
-0:0/1/flip_h = true
-0:0/2 = 2
-0:0/2/flip_v = true
-0:0/3 = 3
-0:0/3/transpose = true
-1:0/next_alternative_id = 4
-1:0/0 = 0
-1:0/1 = 1
-1:0/1/flip_h = true
-1:0/2 = 2
-1:0/2/flip_v = true
-1:0/3 = 3
-1:0/3/transpose = true
-2:0/0 = 0
-3:0/0 = 0
-4:0/0 = 0
-5:0/0 = 0
-6:0/0 = 0
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-5:1/0 = 0
-5:1/1 = 1
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-5:1/3/transpose = true
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-7:1/0 = 0
-8:1/0 = 0
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-10:1/0 = 0
-11:1/0 = 0
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-22:1/0 = 0
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-24:1/0 = 0
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-28:1/0 = 0
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-30:1/0 = 0
-31:1/0 = 0
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-2:2/0 = 0
-3:2/0 = 0
-4:2/0 = 0
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-6:2/0 = 0
-7:2/0 = 0
-8:2/0 = 0
-9:2/0 = 0
-10:2/0 = 0
-11:2/0 = 0
-12:2/0 = 0
-13:2/0 = 0
-14:2/0 = 0
-15:2/0 = 0
-16:2/0 = 0
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-18:2/0 = 0
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-20:2/0 = 0
-21:2/0 = 0
-22:2/0 = 0
-23:2/0 = 0
-24:2/0 = 0
-25:2/0 = 0
-26:2/0 = 0
-27:2/0 = 0
-28:2/0 = 0
-29:2/0 = 0
-30:2/0 = 0
-31:2/0 = 0
-0:3/0 = 0
-1:3/0 = 0
-2:3/0 = 0
-3:3/0 = 0
-4:3/0 = 0
-5:3/0 = 0
-6:3/0 = 0
-7:3/0 = 0
-8:3/0 = 0
-9:3/0 = 0
-10:3/0 = 0
-11:3/0 = 0
-12:3/0 = 0
-13:3/0 = 0
-14:3/0 = 0
-15:3/0 = 0
-16:3/0 = 0
-17:3/0 = 0
-18:3/0 = 0
-19:3/0 = 0
-20:3/0 = 0
-21:3/0 = 0
-22:3/0 = 0
-23:3/0 = 0
-24:3/0 = 0
-25:3/0 = 0
-26:3/0 = 0
-27:3/0 = 0
-28:3/0 = 0
-29:3/0 = 0
-30:3/0 = 0
-31:3/0 = 0
-0:4/0 = 0
-1:4/0 = 0
-2:4/0 = 0
-3:4/0 = 0
-4:4/0 = 0
-5:4/0 = 0
-6:4/0 = 0
-7:4/0 = 0
-8:4/0 = 0
-9:4/0 = 0
-10:4/0 = 0
-11:4/0 = 0
-12:4/0 = 0
-13:4/0 = 0
-14:4/0 = 0
-15:4/0 = 0
-16:4/0 = 0
-17:4/0 = 0
-18:4/0 = 0
-19:4/0 = 0
-20:4/0 = 0
-21:4/0 = 0
-22:4/0 = 0
-23:4/0 = 0
-24:4/0 = 0
-25:4/0 = 0
-26:4/0 = 0
-27:4/0 = 0
-28:4/0 = 0
-29:4/0 = 0
-30:4/0 = 0
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 script = ExtResource("1_ysxum")
 
-[node name="World" type="TileMap" parent="."]
-tile_set = SubResource("TileSet_t3bbo")
-format = 2
-layer_0/name = "Terrain"
-layer_1/name = "Buildings"
-layer_1/enabled = true
-layer_1/modulate = Color(1, 1, 1, 1)
-layer_1/y_sort_enabled = false
-layer_1/y_sort_origin = 0
-layer_1/z_index = 0
-layer_1/tile_data = PackedInt32Array()
-script = ExtResource("3_6q5ju")
+[node name="TileMapGenerator" type="CanvasLayer" parent="."]
+script = ExtResource("2_cbjcm")
 
-[node name="CameraZoom2D" parent="World" instance=ExtResource("4_rx82t")]
+[node name="EntityPlacer" type="Control" parent="."]
+layout_mode = 3
+anchors_preset = 0
+offset_right = 40.0
+offset_bottom = 40.0
+script = ExtResource("5_8jju5")
+
+[node name="CameraZoom2D" parent="." instance=ExtResource("4_rx82t")]
 position = Vector2(960, 536)
 limit_left = -40000
 limit_top = -40000
@@ -1535,8 +88,7 @@ offset_right = 936.0
 offset_bottom = 256.0
 horizontal_alignment = 2
 
-[connection signal="set_camera_position" from="." to="World/CameraZoom2D" method="_on_set_camera_position"]
-[connection signal="button_pressed" from="UILayer/Control" to="World" method="_on_control_button_pressed"]
+[connection signal="set_camera_position" from="." to="CameraZoom2D" method="_on_set_camera_position"]
 [connection signal="pressed" from="UILayer/Control/ConstructionPanel/button_residental" to="UILayer/Control" method="_on_button_residental_pressed"]
 [connection signal="pressed" from="UILayer/Control/ConstructionPanel/button_commercial" to="UILayer/Control" method="_on_button_commercial_pressed"]
 [connection signal="pressed" from="UILayer/Control/ConstructionPanel/button_industrial" to="UILayer/Control" method="_on_button_industrial_pressed"]
diff --git a/scripts/Control.gd b/scripts/Control.gd
index a125fb3..ab6a5db 100644
--- a/scripts/Control.gd
+++ b/scripts/Control.gd
@@ -22,7 +22,11 @@ func _ready():
 
 # Called every frame. 'delta' is the elapsed time since the previous frame.
 func _process(_delta):
-	debug_info.set_text(str(get_viewport().get_mouse_position()) +"\n" + "FPS " + str(Engine.get_frames_per_second()))
+	debug_info.set_text(
+		str(get_viewport().get_mouse_position()) +"\n" + 
+		"FPS " + str(Engine.get_frames_per_second()) + "\n" +
+		"Zoom lvl: " + str(Globals.CAMERA_ZOOM_LEVEL)
+	)
 	
 # defines construction toolbar buttons	
 func create_buttons():
diff --git a/scripts/World.gd b/scripts/EntityPlacer.gd
similarity index 59%
rename from scripts/World.gd
rename to scripts/EntityPlacer.gd
index cec4a31..d6a1275 100644
--- a/scripts/World.gd
+++ b/scripts/EntityPlacer.gd
@@ -1,22 +1,11 @@
-class_name World
-extends TileMap
+class_name EntityPlacer
+extends Control
 
 var has_placeable_building: bool = false
 var building
 var building_type: String
 var scene
 
-func _init():
-	Globals.world_map = self
-
-# Called when the node enters the scene tree for the first time.
-func _ready():	
-	pass
-	
-# Called every frame. 'delta' is the elapsed time since the previous frame.
-func _process(_delta):
-	pass
-
 func get_building_properties() -> Array:
 	var tileset_id = 0 # default value
 	var tilemap_tile_coords: Vector2i
@@ -62,40 +51,40 @@ func _on_control_button_pressed(type):
 	scene = load(Globals.SCENE_PATH + "Building.tscn")	
 	building = scene.instantiate()	
 	#building.set_cell(0, Vector2i(0,0), building_properties[0], building_properties[1], 0)
-	add_child(building)
+	#add_child(building)
 	
 	has_placeable_building = true	
 
-func _input(event):	
-	# place the building
-	if event.is_action_pressed("place_building") and has_placeable_building:
-		has_placeable_building = false
-		place_building_to_map()
-	
-	# cancel placement
-	if event.is_action_pressed("cancel"):
-		if has_placeable_building:
-			pass
+#func _input(event):	
+#	# place the building
+#	if event.is_action_pressed("place_building") and has_placeable_building:
+#		has_placeable_building = false
+#		place_building_to_map()
+#
+#	# cancel placement
+#	if event.is_action_pressed("cancel"):
+#		if has_placeable_building:
+#			pass
 
 func calculate_grid_coordinates(map_position: Vector2) -> Vector2:
 	return (map_position).floor()
 	
-func place_building_to_map():
-	var building_properties = get_building_properties()
-	var tile_on_mouse = local_to_map(get_global_mouse_position())
-	
-	if !Globals.are_coords_valid(
-		tile_on_mouse.y,
-		Vector2i(0, Globals.map_image_size.y),
-		Globals.ERROR_TILE_Y_COORDS_OUT_OF_BOUNDS
-	):
-		return false
-	elif !Globals.are_coords_valid(
-		tile_on_mouse.x,
-		Vector2i(0, Globals.map_image_size.x),
-		Globals.ERROR_TILE_X_COORDS_OUT_OF_BOUNDS
-	):
-		return false	
+#func place_building_to_map():
+#	var building_properties = get_building_properties()
+#	#var tile_on_mouse = local_to_map(get_global_mouse_position())
+#
+#	if !Globals.are_coords_valid(
+#		tile_on_mouse.y,
+#		Vector2i(0, Globals.map_image_size.y),
+#		Globals.ERROR_TILE_Y_COORDS_OUT_OF_BOUNDS
+#	):
+#		return false
+#	elif !Globals.are_coords_valid(
+#		tile_on_mouse.x,
+#		Vector2i(0, Globals.map_image_size.x),
+#		Globals.ERROR_TILE_X_COORDS_OUT_OF_BOUNDS
+#	):
+#		return false	
 
-	set_cell(Globals.LAYER_BUILDINGS, tile_on_mouse, building_properties[0], building_properties[1], 0)
+#	set_cell(Globals.LAYER_BUILDINGS, tile_on_mouse, building_properties[0], building_properties[1], 0)
 	
diff --git a/scripts/Globals.gd b/scripts/Globals.gd
index dd5fd1b..78fbb50 100644
--- a/scripts/Globals.gd
+++ b/scripts/Globals.gd
@@ -20,8 +20,17 @@ func are_coords_valid(value:int, bounds:Vector2i, errmsg:String) -> bool:
 func choose_randomly(list_of_entries):
 	return list_of_entries[randi() % list_of_entries.size()]
 
-var world_map: TileMap
-var map_image_size:Vector2i
+# map size is based on input image x*y pixel size
+var map_size:Vector2i
+
+# store terrain type (water, land, forest etc. for every map cell)
+var map_terrain_data:Array[Array] = [[]]
+
+# preprocess and store exact tile for every map cell to speed up setting tiles
+var map_tile_data:Array[Array] = [[]]
+
+# current camera zoom level
+var CAMERA_ZOOM_LEVEL: float = 1.0
 
 # FILE PATHS
 const SCENE_PATH:String = "res://scenes/"
@@ -52,8 +61,6 @@ const TYPE_ROADS:String = "roads"
 const TYPE_DEMOLISH:String = "demolish"
 
 # camera movement settings
-var CAMERA_ZOOM_LEVEL: float = 1.0
-
 const CAMERA_MIN_ZOOM_LEVEL: float = 0.1
 const CAMERA_MAX_ZOOM_LEVEL: float = 2.0
 const CAMERA_ZOOM_FACTOR: float = 0.1
@@ -65,10 +72,10 @@ const GROUND_TILE_COLOR_IN_MAP_FILE: Color = Color(0,0,0,1)
 const WATER_TILE_COLOR_IN_MAP_FILE: Color = Color(1,1,1,1)
 
 # min and max sizes for a map so the map won't be unreasonably small or large
-const MAP_MIN_HEIGHT:int = 100
-const MAP_MAX_HEIGHT:int = 1000
-const MAP_MIN_WIDTH:int = 100
-const MAP_MAX_WIDTH:int = 1000
+const MAP_MIN_HEIGHT:int = 128
+const MAP_MAX_HEIGHT:int = 4096
+const MAP_MIN_WIDTH:int = 128
+const MAP_MAX_WIDTH:int = 4096
 
 # tile size
 const TILE_SIZE_X:int = 16
diff --git a/scripts/Main.gd b/scripts/Main.gd
index 13241f7..49b2b3f 100644
--- a/scripts/Main.gd
+++ b/scripts/Main.gd
@@ -12,10 +12,15 @@ extends Node
 signal set_camera_position(pos:Vector2)
 
 # The idea is for the user to be able to choose the map from GUI later
-#var map_filename: String = "res://maps/tampere_10x10km_1000px.png"
-var map_filename:String = "res://maps/tampere_200px_crop.png"
-var _world := World.new()
-var _world_generator := WorldGeneration.new()
+var map_filenames:Array = [
+	"res://maps/tampere_10x10km_1000px.png",
+	"res://maps/tampere_10x10km_1024px.png",
+	"res://maps/varkaus_256x256px_test.png"
+	]
+var map_filename:String = map_filenames[2]
+var _world_generator:WorldGenerator
+var _tilemap_generator:TileMapGenerator
+
 
 func _init():
 #	DisplayServer.window_set_size(
@@ -26,20 +31,27 @@ func _init():
 	
 # Called when the node enters the scene tree for the first time.
 func _ready():	 
-	if !_world:
-		push_error(Globals.ERROR_MAKING_WORLD_INSTANCE)
-		quit_game()
-		
+	# create a new world and worldgenerator
+	_world_generator = WorldGenerator.new()
+	_tilemap_generator = TileMapGenerator.new()	
+	
 	# generate terrain. quit game if generation fails.	
 	if !_world_generator.generate_world(map_filename):
 		push_error(Globals.ERROR_WHILE_GENERATING_MAP)
-		quit_game()		
+		quit_game()	
+	
+	if !_tilemap_generator:
+		push_error(Globals.ERROR_MAKING_WORLD_INSTANCE)
+		quit_game()
+		
+	_tilemap_generator.start()
+	_tilemap_generator.test_func()
 		
 	# center camera to world map
 	emit_signal(
 		"set_camera_position", 
-		Vector2(Globals.map_image_size.x / 2.0 * Globals.TILE_SIZE_X, 
-				Globals.map_image_size.y / 2.0 * Globals.TILE_SIZE_Y)
+		Vector2(Globals.map_size.x / 2.0 * Globals.TILE_SIZE_X, 
+				Globals.map_size.y / 2.0 * Globals.TILE_SIZE_Y)
 	)
 
 # Called every frame. 'delta' is the elapsed time since the previous frame.
diff --git a/scripts/TileMapGenerator.gd b/scripts/TileMapGenerator.gd
new file mode 100644
index 0000000..2e3bbbc
--- /dev/null
+++ b/scripts/TileMapGenerator.gd
@@ -0,0 +1,57 @@
+class_name TileMapGenerator
+extends CanvasLayer
+
+# one tilemap is one chunk
+# map consists of many chunks
+# chunks are loaded to view when needed
+# chunks are deleted after they are no longer needed (in view)
+
+# This is done to speed up game loading and avoiding setting one large tilemap in one go
+# which is extremely slow in godot 4.0, 4096x4096 takes minutes to fill with set_cell() commands
+
+const CHUNK_SIZE = Vector2i(128,128)
+
+var map_tiles:Array[Array] = [[]]
+
+func start() -> void:
+	# Initialize the map tile array with enough chunks to cover the whole map
+	
+	var ms:int = Globals.map_size.y/CHUNK_SIZE.y
+	map_tiles.resize(2)
+	print("map tiles size y: ", map_tiles.size())
+	
+	for y in ms:
+		map_tiles[y].resize(2)
+		print("map tiles size x: ", map_tiles[y].size())		
+		for x in ms:	
+			map_tiles[y][x] = TileMap.new()			
+	
+func test_func():
+	self.set_chunk_tiles(Vector2i(1,0))
+	#self.map_tiles[0][1].visible()
+	print(map_tiles[0][1])
+	
+func clear_chunk_tiles(chunk_pos:Vector2i) -> void:
+	map_tiles[chunk_pos.y][chunk_pos.x].clear()
+
+func set_chunk_tiles(chunk_pos:Vector2i) -> void:
+	# Set an invidiual chunk's tiles based on map terrain data
+	
+	# Try to load the world tilemap where we place the tiles
+	if (map_tiles[chunk_pos.y][chunk_pos.x] == null):
+		var errmsg = Globals.ERROR_TILEMAP_NODE_MISSING
+		push_error(errmsg % str(chunk_pos))
+		#return false
+		
+	for y in CHUNK_SIZE.y:
+		for x in CHUNK_SIZE.x:
+			var tile_data: Array = Globals.map_tile_data[chunk_pos.y*CHUNK_SIZE.y][chunk_pos.x*CHUNK_SIZE.x]
+			
+			# layer | tile coords at tilemap | tilemap id | coords of the tile at tileset | alternative tile
+			map_tiles[chunk_pos.y][chunk_pos.x].set_cell(
+				Globals.LAYER_TERRAIN,
+				Vector2i(x, y),
+				2,
+				tile_data[0],
+				tile_data[1]
+			)
diff --git a/scripts/WorldGeneration.gd b/scripts/WorldGenerator.gd
similarity index 62%
rename from scripts/WorldGeneration.gd
rename to scripts/WorldGenerator.gd
index fb27efd..6327970 100644
--- a/scripts/WorldGeneration.gd
+++ b/scripts/WorldGenerator.gd
@@ -1,8 +1,8 @@
-class_name WorldGeneration
+class_name WorldGenerator
 extends RefCounted
 
 var image:Image = Image.new()	
-var map_tile_data:Array[Array] = [[]] # store map tile info to a 2d array
+
 var directions:Array = [
 	Vector2i(0,1),	# south
 	Vector2i(1,0),	# east
@@ -10,15 +10,15 @@ var directions:Array = [
 	Vector2i(-1,0)  # west
 	]
 
-func choose_tile(tile:Vector2i, selected, surrounding) -> void:
+func choose_tile(tile:Vector2i, selected, surrounding) -> Array:
 	var surrounding_tiles:Array = []
 			
 	# determine which directions have land around the tile
 	for dir in directions:
 		# avoid index out of bounds
-		if (tile.y+dir.y >= Globals.map_image_size.y) or (tile.x+dir.x >= Globals.map_image_size.x):
+		if (tile.y+dir.y >= Globals.map_size.y) or (tile.x+dir.x >= Globals.map_size.x):
 			surrounding_tiles.append(surrounding)
-		elif map_tile_data[tile.y+dir.y][tile.x+dir.x] == surrounding:
+		elif Globals.map_terrain_data[tile.y+dir.y][tile.x+dir.x] == surrounding:
 			surrounding_tiles.append(surrounding)
 		else:
 			surrounding_tiles.append(selected)	
@@ -33,14 +33,10 @@ func choose_tile(tile:Vector2i, selected, surrounding) -> void:
 	else:
 		tile_coords = selected_tile[0]
 		
-	# layer | position coords | tilemap id | coords of the tile at tilemap | alternative tile
-	Globals.world_map.set_cell(
-		Globals.LAYER_TERRAIN,
-		Vector2i(tile.x, tile.y),
-		2,
+	return [
 		tile_coords,
 		0 if selected_tile else Globals.choose_randomly([0,1,2,3])
-	)	
+		]
 	
 # Generates biomes, like forest and bog
 func generate_biomes() -> void:
@@ -56,25 +52,25 @@ func generate_biomes() -> void:
 	
 	var water_next_to_tile:bool = false
 
-	for y in map_tile_data.size():
-		for x in map_tile_data[y].size():		
+	for y in Globals.map_terrain_data.size():
+		for x in Globals.map_terrain_data[y].size():		
 				
 			# replace non-water with biomes			
-			if map_tile_data[y][x] > 0:	
+			if Globals.map_terrain_data[y][x] > 0:	
 				water_next_to_tile = false
 				
 				# don't put forest next to water
 				for dir in directions:
-					if (y+dir.y >= Globals.map_image_size.y) or (x+dir.x >= Globals.map_image_size.x):
+					if (y+dir.y >= Globals.map_size.y) or (x+dir.x >= Globals.map_size.x):
 						continue
-					if map_tile_data[y+dir.y][x+dir.x] == Globals.TILE_WATER:
+					if Globals.map_terrain_data[y+dir.y][x+dir.x] == Globals.TILE_WATER:
 						water_next_to_tile = true
 				
 				# if there's no water next to a land tile, it can be replaced with forest
 				if !water_next_to_tile:
 					var noise_sample = fnl.get_noise_2d(x,y)
 					if noise_sample < 0.1:
-						map_tile_data[y][x] = Globals.TILE_FOREST	
+						Globals.map_terrain_data[y][x] = Globals.TILE_FOREST	
 					# can add other tresholds here for other biomes
 
 func generate_world(filename) -> bool:	
@@ -86,58 +82,67 @@ func generate_world(filename) -> bool:
 		return false
 				
 	# Check if image is too small or too large
-	Globals.map_image_size = image.get_size()		
+	Globals.map_size = image.get_size()		
 	if !validate_mapgen_params():
 		return false
 	
+	var start = Time.get_ticks_usec()	
 	read_image_pixel_data()
+	var end = Time.get_ticks_usec()
+	print("read image data ", (end-start)/1000.0, "ms")
+	
+	start = Time.get_ticks_usec()	
 	smooth_land_features(Globals.TILE_WATER)  # smooth water	
+	end = Time.get_ticks_usec()
+	print("smooth water ", (end-start)/1000.0, "ms")
+	
+	start = Time.get_ticks_usec()	
 	generate_biomes()
+	end = Time.get_ticks_usec()
+	print("generate biomes ", (end-start)/1000.0, "ms")
+	
+	start = Time.get_ticks_usec()	
 	smooth_land_features(Globals.TILE_FOREST) # smooth out forest
-	set_tilemap_tiles()	
+	end = Time.get_ticks_usec()
+	print("smooth forest ", (end-start)/1000.0, "ms")
+	
+	start = Time.get_ticks_usec()	
+	set_tilemap_tiles()
+	end = Time.get_ticks_usec()
+	print("set tiles ", (end-start)/1000.0, "ms")
 
 	return true
 
 func read_image_pixel_data():
 	# initialize the array to have enough rows
-	map_tile_data.resize(Globals.map_image_size.y)
+	Globals.map_terrain_data.resize(Globals.map_size.y)
+	Globals.map_tile_data.resize(Globals.map_size.y)
 	
-	for y in Globals.map_image_size.y:
+	for y in Globals.map_size.y:
 		#initialize the row to have enough columns
-		map_tile_data[y].resize(Globals.map_image_size.y)
+		Globals.map_terrain_data[y].resize(Globals.map_size.y)
+		Globals.map_tile_data[y].resize(Globals.map_size.y)
+		
 
-		for x in Globals.map_image_size.x:
+		for x in Globals.map_size.x:
 			if image.get_pixel(x, y) == Globals.WATER_TILE_COLOR_IN_MAP_FILE:
-				map_tile_data[y][x] = Globals.TILE_WATER
+				Globals.map_terrain_data[y][x] = Globals.TILE_WATER
 			else:
-				map_tile_data[y][x] = Globals.TILE_TERRAIN				
+				Globals.map_terrain_data[y][x] = Globals.TILE_TERRAIN				
 			
 func set_tilemap_tiles() -> void:
-	for y in map_tile_data.size():
-		for x in map_tile_data[y].size():			
+	for y in Globals.map_terrain_data.size():
+		for x in Globals.map_terrain_data[y].size():			
 			# layer | position coords | tilemap id | coords of the tile at tilemap | alternative tile
-			match map_tile_data[y][x]:
+			match Globals.map_terrain_data[y][x]:
 				Globals.TILE_WATER:	 # water or shoreline
-					choose_tile(Vector2i(x, y), Globals.TILE_WATER, Globals.TILE_TERRAIN)
+					Globals.map_tile_data[y][x] = choose_tile(Vector2i(x, y), Globals.TILE_WATER, Globals.TILE_TERRAIN)
 						
 				Globals.TILE_TERRAIN: #terrain or forest edge
-#					Globals.world_map.set_cell(
-#						Globals.LAYER_TERRAIN,
-#						Vector2i(x, y),
-#						2,
-#						Vector2i(0,0),
-#						Globals.choose_randomly([0,1,2,3])
-#					)
-					choose_tile(Vector2i(x,y), Globals.TILE_TERRAIN, Globals.TILE_FOREST)
+					Globals.map_tile_data[y][x] = choose_tile(Vector2i(x,y), Globals.TILE_TERRAIN, Globals.TILE_FOREST)
 					
 				Globals.TILE_FOREST:					
-					Globals.world_map.set_cell(
-						Globals.LAYER_TERRAIN,
-						Vector2i(x, y),
-						2,
-						Vector2i(5,1),
-						Globals.choose_randomly([0,1,2,3])
-					)
+					Globals.map_tile_data[y][x] = [Vector2i(5,1), Globals.choose_randomly([0,1,2,3])]
 						
 				_:  #default
 					pass
@@ -147,9 +152,9 @@ func set_tilemap_tiles() -> void:
 # Do it recursively with limit of n recursions!
 func smooth_land_features(tile_type:int) -> void:
 	# TODO for testing avoid map borders to make it simpler to implement			
-	for y in range(1, Globals.map_image_size.y-1):
-		for x in range(1, Globals.map_image_size.x-1):
-			if map_tile_data[y][x] != tile_type:
+	for y in range(1, Globals.map_size.y-1):
+		for x in range(1, Globals.map_size.x-1):
+			if Globals.map_terrain_data[y][x] != tile_type:
 				continue
 				
 			match tile_type:
@@ -173,26 +178,26 @@ func smooth_forest_recursively(pos:Vector2i, selected:int, comp:int) -> void:
 
 	# determine which directions have land around the tile
 	for dir in directions:
-		if map_tile_data[pos.y+dir.y][pos.x+dir.x] == comp:
+		if Globals.map_terrain_data[pos.y+dir.y][pos.x+dir.x] == comp:
 			surrounding_tiles.append(comp)
-		elif map_tile_data[pos.y+dir.y][pos.x+dir.x] == selected:
+		elif Globals.map_terrain_data[pos.y+dir.y][pos.x+dir.x] == selected:
 			surrounding_tiles.append(selected)	
 
 	match surrounding_tiles:
 		[1,1,1,2]: #west
-			map_tile_data[pos.y][pos.x] = comp	
+			Globals.map_terrain_data[pos.y][pos.x] = comp	
 			pos.x -= 1
 		[1,1,2,1]: #north
-			map_tile_data[pos.y][pos.x] = comp	
+			Globals.map_terrain_data[pos.y][pos.x] = comp	
 			pos.y -= 1
 		[1,2,1,1]: #east
-			map_tile_data[pos.y][pos.x] = comp	
+			Globals.map_terrain_data[pos.y][pos.x] = comp	
 			pos.x += 1
 		[2,1,1,1]: #south
-			map_tile_data[pos.y][pos.x] = comp	
+			Globals.map_terrain_data[pos.y][pos.x] = comp	
 			pos.y += 1
 		[1,1,1,1]: # remove solo forests
-			map_tile_data[pos.y][pos.x] = comp	
+			Globals.map_terrain_data[pos.y][pos.x] = comp	
 			return
 		_:
 			return 		
@@ -205,46 +210,40 @@ func smooth_recursively(pos:Vector2i, selected:int, comp:int) -> void:
 
 	# determine which directions have land around the tile
 	for dir in directions:
-		if map_tile_data[pos.y+dir.y][pos.x+dir.x] == comp:
+		if Globals.map_terrain_data[pos.y+dir.y][pos.x+dir.x] == comp:
 			surrounding_tiles.append(comp)
-		elif map_tile_data[pos.y+dir.y][pos.x+dir.x] == selected:
+		elif Globals.map_terrain_data[pos.y+dir.y][pos.x+dir.x] == selected:
 			surrounding_tiles.append(selected)	
 
 	match surrounding_tiles:
 		[1,1,1,0]: #west
-			map_tile_data[pos.y][pos.x] = comp	
+			Globals.map_terrain_data[pos.y][pos.x] = comp	
 			pos.x -= 1
 		[1,1,0,1]: #north
-			map_tile_data[pos.y][pos.x] = comp	
+			Globals.map_terrain_data[pos.y][pos.x] = comp	
 			pos.y -= 1
 		[1,0,1,1]: #east
-			map_tile_data[pos.y][pos.x] = comp	
+			Globals.map_terrain_data[pos.y][pos.x] = comp	
 			pos.x += 1
 		[0,1,1,1]: #south
-			map_tile_data[pos.y][pos.x] = comp	
+			Globals.map_terrain_data[pos.y][pos.x] = comp	
 			pos.y += 1
 		_:
 			return 		
 		
 	smooth_recursively(pos, selected, comp)
-
+	
 func validate_mapgen_params() -> bool:
 	if !Globals.are_coords_valid(
-		Globals.map_image_size.y,
+		Globals.map_size.y,
 		Vector2i(Globals.MAP_MIN_HEIGHT, Globals.MAP_MAX_HEIGHT),
 		Globals.ERROR_IMAGE_HEIGHT_INCORRECT):
 		return false
 		
 	elif !Globals.are_coords_valid(
-		Globals.map_image_size.x,
+		Globals.map_size.x,
 		Vector2i(Globals.MAP_MIN_WIDTH, Globals.MAP_MAX_WIDTH),
 		Globals.ERROR_IMAGE_WIDTH_INCORRECT):
 		return false
 		
-	# Try to load the world tilemap where we place the tiles
-	if (Globals.world_map == null):
-		var errmsg = Globals.ERROR_WORLD_TILEMAP_NODE_MISSING % Globals.WORLD_NODE
-		push_error(errmsg)
-		return false
-		
 	return true