Whenever there is a long list of items in User Preferences, such as Key-Binding list in Input. Blender gets supper lagy while scrolling up and down on the long list, it is so laggy that Blender becomes unresponsive for a few seconds. As result of that, scrolling the list is very chappy. Is it a bug in 2.77 or something weird is going on my side? Thanks in advance.
No problem at all so it’s most likely something your end, drivers etc.
If it is repeatable report it to bug tracker
Thanks! A clean reinstall of latest video driver solved it.