What operating system is Emacs + Evil slow on, may I ask? And which operations are slow? Emacs's term mode, shell mode, etc, are 100s of times slower than most

What operating system is Emacs + Evil slow on, may I ask? And which operations are slow? Emacs's term mode, shell mode, etc, are 100s of times slower than most terminal apps at scrolling thousands of lines at the user, which is a common part of the workflow of some C programmers. Is that where it is slow for you?