Nothing currently. Press Enter + R to set the rendering mode. Lag is expected unless if you have a very good computer. Even with optimizations like spatial partitioning and offloading physics when entities do not move, Scratch is still very slow for this type of project. Even just rendering will eventually become a large part of the lag when I add animations and multi-segmented entities.
Currently shared if anyone wants to help on the project by creating artwork or code. Code will be manually reviewed and must be decently readable with clear variable names (Most of the formatting is just from Java). The max map size is 200,000 by 160,000 due to spatial partitioning limits (500 by 400 squares, each square is 500 in size) (This is not up to date information, the square sizes are much different now.) Fixed a minor spelling mistake in the title with "the" being capitalized.