I've tried several fixes for this including disabling CL, changing cache settings, and reducing drawing mode from adavanced to basic. Nothing is working.
These are my specs..
Adobe Photoshop Version: 13.0 (13.0 20120315.r.428 2012/03/15:21:00:00) x64
Operating System: Windows 7 64-bit
System architecture: AMD CPU Family:15, Model:10, Stepping:0 with MMX, SSE Integer, SSE FP, SSE2, SSE3
Physical processor count: 6
Processor speed: 2693 MHz
Built-in memory: 6143 MB
Free memory: 4351 MB
Memory available to Photoshop: 5374 MB
Memory used by Photoshop: 83 %
Image tile size: 132K
Image cache levels: 4
OpenGL Drawing: Enabled.
OpenGL Drawing Mode: Basic
OpenGL Allow Normal Mode: True.
OpenGL Allow Advanced Mode: True.
OpenGL Allow Old GPUs: Not Detected.
Video Card Vendor: ATI Technologies Inc.
Video Card Renderer: ATI Radeon HD 5800 Series
Display Bounds:= top: 0, left: 0, bottom: 1050, right: 1680
Video Card Number: 1
Video Card: ATI Radeon HD 5800 Series
Driver Version: 8.980.0.0
Driver Date: 20120611000000.000000-000
Video Card Driver: aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,ati umd64.dll,atidxx64.dll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdv a,atiumd6a.cap,atitmm64.dll
Video Mode: 1680 x 1050 x 4294967296 colors
Video Card Caption: ATI Radeon HD 5800 Series
Video Card Memory: 1024 MB
Video Rect Texture Size: 16384
Photoshop scratch has async I/O enabled
C:\, 919.2G, 807.9G free
Another option suggested I disabled GL but the advanced interface did not have the open GL option visible in the same location as the guide.
I did not have brush lag until I started using the air brush. I did increase canvas size and make the file much larger but the lag did not happen until after I switched brush types. It is possible that I did not notice the lag until I switched.
How big is the canvas (in pixels horizontally x vertically)?
What mode and data depth (e.g., RGB, CMYK, grayscale; 8 bits/channel, 16 bits, etc.)?
How big is the brush in pixels?
What brush is selected?
You mentioned the airbrush option enabled. What are the other settings?
Ideally, a screenshot showing the whole desktop environment when you're brushing will be helpful.
Can you quantify the lag? As in, "I click in the upper-left corner of the image, then shift-click in the lower-right corner, and it takes the brush x.y seconds to stroke across the image." Be as accurate as you can; a 0.5 second lag is way different than a 5 second lag.
Be aware that very large brushes have to manipulate a huge number of pixels and can slow things down.
horizontally 1512 vertically 1296
I didnt have airbrushing enabled. I was using the "airbrush." I think it was airbrush low density grainy at quite a large setting as I was working on blocking in a background color change. I believe in the area of 100 pixels. I also switched to one of the spatter brushes shortly after, similar in size. When I use the shift click option I approximate the lag from top left corner to bottom right corner is 4 seconds. It is quite a lot of lag. In photoshop CS5 my computer ran very large images without issue regardless of brush size. In fact I've done larger images by multiple times...several thousand pixels.
Thanks for the detailed info. Yes, that's unambiguously WAY slower than what I'm seeing. I even pushed it up to 300 pixels and it just keeps up, no matter how quickly I brush around, with all the Brush settings maxed. Something's definitely amiss on your setup.
I don't see too much wrong in your specs; your display driver is up to date. An 83% Photoshop RAM limit might be a bit high for a 6 GB system, but I can't see how it would slow things consistently.
I do see that you have not moved up to Windows 7 service pack 1. Adobe does say they require SP1 for Photoshop CS6. Did you avoid updating to SP1 for a reason?
Do you see the same slow speed if you temporarily disable the [ ] Use Graphics Processor setting (making sure to restart Photoshop after and before testing)?
Also, this is an issue of mixer brush. I restarted the program and becan painting. I thought I had fixed it because the lag seemed to disappear. I realized before the first stroke was complete that it was the paintbrush and not the mixerbrush I was using. I turned the mixerbrush back on, and the lag immediately comes back. The lag stays when I switch to back to paintbrush. It seems it has something to do with mixerbrush.
I can update more. I recently reset my computer to factory settings to clean out my PC. If that could be the issue then I will go through and update all of those. I will also check the rest. Thank you for your help...it has been driving me nuts.
Everything was going well. I downloaded and installed the service pack. I opened my file and used a spatter brush for a couple of minutes. I decided to mess with some other brushes to play with the texture of the background. I selected "water color build up" brush and began to lag immediately after using it in the background. I restarted photoshop and resumed using the splatter brush but it continues to lag.