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Lithium: Actual Garry's Mod FPS Boost

Github[github.com] - Bugreports, Feature requests, contributions.
Lithium is a multipurpose multirealm performance improvement addon aimed at trying to optimise gmod's parts that can be accessed through addons as much as possible.
This addon will improve your performance, especially with poorly-written addons.

NikNaks - BSP Reader for "Last Resort" aka "FPS Maxxing" system. Does not impact performance when idle.

There is a special menu in Utilities tab where you can configure lithium specifically for you. See Utilities -> Lithium.

Use convars lithium_enabled_cl and lithium_enabled_sv to disable lithium on either client or server (set both to enable/disable on both). Also, report the problem, providing a log in the github issues or down in the comments.
Also, if you want to disable one particular system, you can create file with name lithium_dontload.txt in folder garrysmod/data with content yes to stop lithium from loading.

- ANY mod that modifies hook table. That means that at the moment this is incompatible with DLIb and similar addons.
- Exception: This mod is compatible with ULX and ULib.

- New hook system (see what it means below).
- Better Rendering (see what it means below).
- Automatic garbage collection.
- Improved some render calls, Material, GetConVar, CreateConVar calls.
- GPU Saver when out-of-focus.

Q: What does "new hook system" means?
A: TL;DR: This makes Garry's mod faster. Lithium provides a drop-in hook module replacement which ranks at about 40% best-case and 25% average performance increase in C++ -> Lua tests. Hooks are an essential part of Garry's mod which allow addons to "hook into" events that game calls from time to time. While some hooks are called just once in a while, others can be called multiple times every frame, so optimised hook module can give anywhere from 0 improvement to "the best you would even imagine".
Q: How exactly did you made "rendering" "better"?
A: By default, Garry's Mod renders entities even if they are not realistically visible, e.g. behind a wall or another entity. That too costs some performance, so, lithium disables rendering of entities that are not actually visible. That by itself can gain about 50 fps on busy servers