Ubuntu 9.04 Flash Fullscreen Stutter

Found the solution here via here:

First find where the prefetched location is.

:lspci -vv

For my computer it is at 0xd0000000. So I then do

:sudo -s
:echo "base=0xd0000000 size=0x10000000 type=write-combining" > /proc/mtrr

Now things run well.