Massive Slowdown

Hi, immediatly after the 1.10.4(4) update I attempted to log in, and succesfully got on after a few minutes of waiting... however my framerate is stuck in the single digits (Usually lower single digits.) After quite a few hours I got back on, and I was able to log on with no problem, but my framerate is aweful and things are loading at a snail's pace.

Here's what's in my Second Life info box:
"CPU: Not supported (2793 Mhz)
Memory: 1023 MB
OS Version: Microsoft Windows XP Service Pack 2 (Build 2600)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce 6800/PCI/SSE2
OpenGL Version: 2.0.1
Packets Lost: 85/60083 (0.1%)"

My CPU has 64-bit architecture, Pentium D; if that helps in any way. I usually have 35+ fps in all but the most crowded of areas. Bandwidth is fine. After lowering the draw distance significantly... the framerate doesn't budge.

Still getting 3fps despite changing every type of performance option available; reinstalling GPU drivers; restarting the computer half a dozen times; etc...

When I open the map the fps goes down to about 0.1

*EDIT*
I have very high user and sim ping. Much higher than I've had before.