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The biggest issue of Essentials regarding the framerate is the RGSS : It's an old ass game engine that doesn't use the power of the GPU and it's using a very old Ruby version that is very slow.
Since I rewritten the RGSS for my personnal engine I can acheive stupid framerates without VSYNC and it's all because instead of drawing everything my engine only tells the GPU to do the fucking work. (Screenshot related with map connexion).
If you want to make a game that works fine with Essentials you'll have to reduce the usage of community scripts (cause most of them are badly done) and try to optimize some scripts of Essentials. Otherwise you can still use an other game engine or do some ROM Hacking since at least it works and run at 60FPS.
