The c00lgui hub is largely considered a rather than a high-performance tool. Most reviewers on platforms like YouTube note that while it's fun for "messing around," many features are outdated and may cause your game to crash. If you'd like, I can help you with: Finding updated alternatives that are more stable.
Modern versions of the c00lgui script (such as the C00lKid v2 or "reborn" versions) are typically loaded via a [Roblox Executor]—a third-party tool used to run custom Lua scripts within the game.
Power slide controls, telekinesis mechanics, and character size scaling scripts.
Roblox eventually sued some prominent exploit developers, and the "Golden Age" ended. The "c00lgui" name slowly faded as: