In response to Garthor
Because it call Enter on all tiles within the png?
In response to Speedro
Because if you have a hundred turfs that all are using the same icon file but different icon_states, and you do something like, icon += rgb(1,2,3) for one of them, the entire file has to be modified even though you are only using one segment of it.
In response to Speedro
Sorry to repeat myself, but...

Schnitzelnagler wrote:
I know this is just too simple to be considered and would likely (this) debate, but for the sake of actually solving the trouble you're experiencing, would you consider creating a sample project?
This should be a complete new project with just the jpg/png file on the map and a visual representation for the player.

One version to showcase the lag and then a version where you resolved the issue.
Link both including source code and all files required.
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