I'm also experiencing slow output. Scrolling any terminal surface causes 
instant 100% utilization of one processor core.
I haven't noticed any display corruption though.

some system info:

rafal@arnica:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 11.10
Release:        11.10
Codename:       oneiric
rafal@arnica:~$ uname -a
Linux arnica 3.0.0-14-generic #23-Ubuntu SMP Mon Nov 21 20:28:43 UTC 2011 
x86_64 x86_64 x86_64 GNU/Linux
rafal@arnica:~$ cat /proc/driver/nvidia/version
NVRM version: NVIDIA UNIX x86_64 Kernel Module  280.13  Wed Jul 27 16:53:56 PDT 
2011
GCC version:  gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3) 
rafal@arnica:~$ cat /proc/driver/nvidia/gpus/0/information 
Model:           Quadro NVS 140M

It's bothering me so much I'm considering using gprof to investigate it.
As far as I understand it, I'd have to compile each piece of relevant
software from source with special options to get meaningful output,
starting from gnome-terminal and then digging into libraries. Is this
correct?

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https://bugs.launchpad.net/bugs/850649

Title:
  gnome-terminal extremely slow and display buggy

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