Wow getting a 10 FPS increase in those tough spots! Amazing. Visually am I losing anything by using this mod?
Nope. It's optimization through reduction (inlining) of get/set instructions and updating circa 1994 x87 code to 21st century processors (SSE2).
To try and explain it very simply, in programming you normally have "getter" and "setter" functions like "prid* Player:Get() { return this; }". If not optimized, this function will take up multiple CPU instructions, despite instantly returning a value. The optimization provided in the plugin reduces a lot of get/set functions in CPU critical areas down to ONE instruction.
Not all get/set instructions were optimized, and not all code was updated to SSE2. From what other coders are saying there's still more work to be done: Arisu only made this code in a day after profiling it relatively briefly.