slows to a crawl after some use

Binary package hint: gnome-terminal

When I first use gnome-terminal, it starts out at an acceptable speed. However, after 5 minutes or so of use, almost everything I do in it (scrolling, any command with output, vim, sometimes even just typing) pegs the CPU at 100%. Doing a "reset" fixes the problem for another few minutes. This problem is independent between tabs, so if one tab is slow, another might still be acceptably fast.

My instinct is that it has to do with the scrollback buffer. If I immediately enter vim, that terminal seems to be immune from the effects of this bug. Even when the buffer size is well within reasonable limits at under 200 lines, gnome-terminal still pegs the CPU at 100%.