In copy mode, every time the selection is updated (e.g., by moving the mouse), it redraws the whole screen, which is flickery and slow. Either window-copy could be smarter about what to redraw, or screen-write could (at least with xtmux) not generate tty_write events when the contents don't actually change.
In copy mode, every time the selection is updated (e.g., by moving the mouse), it redraws the whole screen, which is flickery and slow. Either window-copy could be smarter about what to redraw, or screen-write could (at least with xtmux) not generate tty_write events when the contents don't actually change.