In Part 20 of my Unreal Engine 5.1 Endless Runner series, I focus completely on optimization—because getting the game “working” is not enough if your FPS drops or your build size becomes huge. I start by showing you how to enable Detailed Stats in the viewport, and what I personally watch first: Draws and Prims. As a rough target, I try to keep Draws under ~300 and Prims under ~250k, and then I optimize step-by-step based on what’s actually expensive. After that, I go through my 5 main tips: using LODs (and how to generate them inside Unreal if your mesh doesn’t have them), enabling/creating texture mip-maps, reducing texture resolution (including bulk edits using Property Matrix), migrating only the required maps to a fresh project to remove unused assets, and lowering draw distance for things like coins and obstacles (I found 5000–7000 works great for coins). Finally, I share rendering settings I use for Windows vs Android—like when I recommend Nanite vs LODs, why I avoid hardware ray tracing on low-end devices, why I don’t like FXAA, and the mobile settings that matter the most (Forward Shading, MSAA, half precision, disabling bloom/AO, etc.).