On Ubuntu 11.04 (natty) 64-bit desktop in Ubuntu Classic mode  3GB RAM

Steps to reproduce:
1. Open a full-screen terminal with e.g. 9 tabs of shells
2. Connect to a mysql database
3. Run a command that produces a few pages of contiguous dashes e.g.
  mysql> show engine innodb status;

This produces the world's longest line consisting entirely of over one pages worth of contiguous dash characters.  ------------------------------------- 

4. Try using the scroll bar to scroll up a few lines, aiming to see the text above the dashes. Then try scrolling back down which produces the same effect.

Actual behaviour:

For me the terminal freezes for up to a minute and after severals seconds the app is greyed out as unresponsive. Eventually the freeze ends and gnome-terminal manages to scroll up 3 or 4 lines in one step. This action freezes all gnome-terminal instances and renders them unusable until they have become responsive again.

Expected behaviour:

The terminal scrolls up 3 or 4 lines promptly and without any problems regardless of what is displayed in the console.

There are no other visual anomolies or graphics problems on this PC, the UI is running smoothly.