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 Most reviewers on platforms like YouTube note that while it's fun for "messing around," many features are outdated and may cause your game to crash.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.
Very Low. Many features are "broken" or "old," likely due to Roblox's forced Filtering Enabled (FE) security measures which prevent client-side scripts from affecting the server. c00lgui fe script hub