First noticed this when my frames absolutely dropped even though I am on a decent computer. Decided to play around and close a few windows and noticed that when I closed my Clock plugin my frames doubled. I tried this with another plugin which uses the Dock Widget Gui and the same thing happened. (Asset manager, Toolbox, Terrain Editor, tag editor, Call Stack, Breakpoints, watch, Activity History, Texture generator, all significantly lower my fps)
Video of event
File to reproduce
Clock.rbxmx (6.2 KB)