My machine is not quite as new. Celeron(M) 1.8GHz, 256MB RAM, Nvidia GeForce4, XpPro SP2 and DirectX 9.0c.
640 x 480
0000 to 0001, occasionally 0003 or 0004
800 x 600
0001 to 0002, occasionally 0004 or 0005
1024 x 768
0029 to 0031, occasionally 0032 or 0033
After selecting 1024 x 768, and sometimes before, it drops to ..
640 x 480
0011 to 0014 or sometimes 0024 to 0030
800 x 600
0018 to 0021 or sometimes 0036 to 0042
1024 x 768
0029 to 0031 or sometimes 0058 to 0060
The more I switch between modes the slower these numbers become, e.g the 640 x 480 will eventually slow to 0017 to 0019 and then ..

.. followed by ..

It all goes a bit downhill from there. 8^)=
I've not tested other graphics commands to see if they suffer as well, it only seems to noticeably slow task #14 and it doesn't seem to matter much what the string length just the number of times task #14 is called.
Lee.