Why is A3 so slow when using brushes on my MacPro?

Does anyone know what I can do to my MacPro so the brushes stop jerking and pausing when using them. I have what I would think is a well equipped machine but I'm getting so tried of the brush stopping for several seconds when I'm brushing in an adjustment. I have my operating system and software on my main drive, with the A3 libraries and photos on a separate drive. I mostly capture RAW files with my Canon 7D. Below are my MP specs. Will a better video card make a considerable difference? Thank you in advance for all the great support in this forum!
System Software Overview:
System Version:          Mac OS X 10.6.8 (10K540)
Kernel Version:          Darwin 10.8.0
Boot Volume:          Macintosh HD
Boot Mode:          Normal
Computer Name:          iDad's Mac Pro
Secure Virtual Memory:          Not Enabled
64-bit Kernel and Extensions:          No
Time since boot:          1 day11:27
Model Name:          Mac Pro
Model Identifier:          MacPro3,1
Processor Name:          Quad-Core Intel Xeon
Processor Speed:          2.8 GHz
Number Of Processors:          2
Total Number Of Cores:          8
L2 Cache (per processor):          12 MB
Memory:          16 GB
Bus Speed:          1.6 GHz
Boot ROM Version:          MP31.006C.B05
SMC Version (system):          1.25f4
Hard Drives: Western Digital 'Caviar BLACK' 7200RPM 6Gb/s HDD 64MB Cache
NVIDIA GeForce 8800 GT:
Chipset Model:          NVIDIA GeForce 8800 GT
Type:          GPU
Bus:          PCIe
Slot:          Slot-1
PCIe Lane Width:          x16
VRAM (Total):          512 MB
Vendor:          NVIDIA (0x10de)
Device ID:          0x0602
Revision ID:          0x00a2
ROM Revision:          3233
Displays:
Display Connector:
Status:          No Display Connected
LCD2690WUXi:
Resolution:          1920 x 1200 @ 60 Hz
Pixel Depth:          32-Bit Color (ARGB8888)
Display Serial Number:          88104014YA
Main Display:          Yes
Mirror:          Off
Online:          Yes
Rotation:          Supported

My guess is the graphics card is not keeping up. With that box I would install a Radeon HD 5870 (or whatever is new now), tests at http://barefeats.com/wst10g7.html
Not that I think it would affect brushes, but the other thing I would do is install a SSD from OWC as boot drive.
HTH
-Allen Wicks

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