Photoshop CS6 - Very Slow Brush Speeds...

Hi:
I thought CS5 was bad, but brushing with CS6 all brush strokes are very, very slow. If I make a brush stoke I have literally have to put my hand on my chin and wait for the brush to catch up. I cannot work like this. Any suggestions on what to do to speed up the brushes? Forget about adding anything else to Photoshop, please work on speeding up exisiting functions.
Photoshop CS6, 13x 64Bit
Thank you, Glenn
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:
10 GB
Bus Speed:
1.6 GHz
Boot ROM Version:
MP31.006C.B05
ATI Radeon HD 2600 XT:
Chipset Model:    ATI Radeon HD 2600
Type:    GPU
Bus:    PCIe
Slot:    Slot-1
PCIe Lane Width:    x16
VRAM (Total):    256 MB
Vendor:    ATI (0x1002)
Device ID:    0x9588
Revision ID:    0x0000
ROM Revision:    113-B1480A-252
EFI Driver Version:    01.00.252
Displays:
SyncMaster:
Resolution:    2560 x 1600
Pixel Depth:    32-Bit Color (ARGB8888)
Display Serial Number:    HVWS200046
Main Display:    Yes
Mirror:    Off
Online:    Yes
Rotation:    Supported
Display Connector:
Status:    No Display Connected

Hi:
I had added a link to my previous post to a page regarding performance that you may want to check out.
Thank you, I'll check it out.
What are your Preferences > Performance settings?
Memory Usage
Available RAM: 9670
Let Photoshop Use: 6769 (70%)
I have a separate scratch disc.
I have an ATI Radeon HD 2600 OpenGL Card set to: 'Use Graphics Processor' in Advanced mode. Tried other settings and this one seems best.
15 History states.
No other programs open.
How many documents (of what sizes) do you have open?
Only 1 PSD file open. File size is about 600 MB. Only a handful of layers.
Does restarting Photoshop have any effect on the issue?
No.
>>Forget about adding anything else to Photoshop, please work on speeding up exisiting functions.<<
Fair enough, I'll save these comments for Adobe!
Thank you, Glenn

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300 ppi for a banner that size is categorically not normal. Guaranteed.
Get specific instructions from the shop that is going to print it.
You keep confusing ppi with dpi. The resolution of an image file really is expressed in ppi, pixels per inch, not "dpi" which is dots per inch. The precise terminology is as follows:
DPI = Dots per inch = units used to measure the resolution of a printer
LPI = Lines per inch = The offset printing 'lines' or dots per inch in a halftone or line screen.
PPI = Pixels per inch = the number of pixels per inch in screen/scanner file terms.
Here's a link to a discussion that may interest you:
http://graphicdesign.stackexchange.com/questions/487/what-ppi-should-a-large-format-artwor k-for-print-be-done-at
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"The rule of thumb is that we need 1.5 to 2 times the LPI in PPI to get acceptable results.
"Viewing Distance   Present Study
20 feet    greater than 10 LPI
18 feet    18.75 LPI or greater
16 feet    18.75 LPI or greater
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8 feet     65 LPI or greater
6 feet     85 LPI or greater
4 feet     100 LPI or greater
2 feet     133 LPI or greater
1 foot     150 LPI or greater
6 inches   150 LPI or greater
"Presumably, for a banner 3m x 5m, you'd be standing at a minimum of, say, 10 feet. (Just eyeballing the wall here.) So, by this table, you'll need 50 LPI minimum. That would mean your raster graphics should be about 100 PPI, or 75 PPI at 12-14 feet. Considering that and the fact that 2x LPI is pretty conservative for reproducing fidelity (often 1.5xLPI is "enough"), this agrees with [the given] advice of 75 PPI being acceptable."
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Options
on 28-10-2012 12h38
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System Up Time: 0:08:24
Port Status TxPkts RxPkts Collisions Tx B/s Rx B/s Up TimeWANLANWLAN
MER
2351
2177
0
136
104
0:00:56
324
0
0
0
0
0:08:24
6762
6743
0
164
132
0:07:57
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766 kbps
414 kbps
48.5 db
27.1 db
15.7 db
16.3 db
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Photoshop CS6 - Very Slow Brush Speeds...

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