Photoshop CS4 AGAIN

Hey guys i forked out for CS4 extended thinking it would be a good upgrade from CS3. So far the program is sooo laggy when it come to using the brushes its ridiculous. I have tried all the things adobe like enabling open gl drawing and so forth dosent help. Its so annoying as its not like CS4 is cheap GRRR.

Here are my stats !

Adobe Photoshop Version: 11.0.1 (11.0.1x20090218 [20090218.r.523 2009/02/18:02:00:00 cutoff; r branch])
Operating System: Windows XP 32-bit
Version: 5.1 Service Pack 3
System architecture: Intel CPU Family:6, Model:7, Stepping:7 with MMX, SSE Integer, SSE FP, SSE2
Physical processor count: 4
Processor speed: 2833 MHz
Video Card: NVIDIA GeForce 9800 GTX/9800 GTX+
Video Mode: 1680 x 1050 x 4294967296 colors
Video Card Driver: nv4_disp.dll
Driver Version: 6.14.11.9107
Built-in memory: 3327 MB
Free memory: 1875 MB
Memory available to Photoshop: 1665 MB
Memory used by Photoshop: 60 %
Image cache levels: 4
Serial number: 92298128698146536983
Application folder: C:\Program Files\Adobe\Adobe Photoshop CS4\
Temporary file path: C:\DOCUME~1\JORDAN~1\LOCALS~1\Temp\
Photoshop scratch has async I/O enabled
Scratch volume(s):
F:\, 97.7G, 84.9G free
Primary Plug-ins folder: C:\Program Files\Adobe\Adobe Photoshop CS4\Plug-ins\
Additional Plug-ins folder: not set