You can play Roblox at a much higher framerate than normal simply by using FPS Unlocker. Learn how to do so right here.

The FPS in Roblox games may drop if the power saving mode is enabled on your Desktop or Laptop. Similar to smartphones, the power-saving mode limits the performance of your graphics card and CPU ...

More importantly, Roblox extensions are generally safe to use. Since extensions aren't altering gameplay in any way, they aren't a bannable offense. However, players using extensions should still ...