I was suspicious since this was released today of all days, but after downloading and installing it this thing has increased my average framerate by about 30. From what I can tell it's pretty legit and nothing abnormal has happened since I installed it; probably just an unfortunate day to release it.
A quote outlining what this addon does:
We compressed SendAddonMessage to help with bandwidth.
We replaced string.match with a much more efficient approximation. Because it's an approximation, it's not entirely accurate, but it turns out that most addons are over-specific in what they look for and our version works very well and is much faster.
We also take over garbage collection entirely. Rather than consistently collecting garbage, we garbage collect only when necessary for memory or when framerate is excessively high, allowing minimization of CPU expenditure for this task.
We modified several internal functions to request less CPU time and memory so that it can instead be deferred to the graphics engine.
Here is the link if anyone wants to give it a go. It simply boosts your fps, so if you already have the game at ultra settings and run it smoothly there isn't really a point. However, if your computer isn't all too powerful it is a great help.