When I make changes in GLSL into DrawPixels (and save user setting) it works fine. When I change something however I am back into trouble. Also setting made by sliders is not doable because it moves in fragments. All other programs on the MacPro are working fine.

What can I do to make the priority higher? The computer configuration in combination with Blender is not workable.

Did you try my suggestion with the Window Draw Method?

I am afraid this is a issue with the GPU driver, we cannot fix a bug, that we cannot reproduce. I have no issues on my Late 2013 Macbook Pro.

I did try all 3 options. If I make a change in the Window Draw settings, (whatever the choice is) it works. Afterwards if I make a change in a setting (fi material) or make adjustment to the object it bad again. So what setting did you made on you MacPro? Perhaps I can try those?

I think its the AMD FirePro D700 6144 MB which is casing the problems. I also have an iMac. No problem whatsoever.

Dear Thomas,

Why did you close this demand? I bought the MacPro and I still have this problem. The MacPro I had before (model nov 2010) worked perfect. Can you give me information how to address this to Apple. I also started a discussion with Apple to try to find a sollution. Is there a possibility to pay for a solution from Blender?

There is no way that we can fix this as far as I know. Blender heavily relies on a proper OpenGL implementation inside the GPU driver, if there are issues, that is outside of what we can do.

CC'ing our Mac mainteiner Jens, maybe he can give you a better tip. Also we have a MacPro 2013 at the Blender Institute and that works fine afaik? @Sergey Sharybin (sergey)

@ Henk
Is this on 10.9.5 or 10.10 Yosemite ?
I also 'am not satisfied with redraws on 10.10 in some circumstances.
The GM2 and 3 introduced sloppy finder and safari in the mains, sometimes
typing is like being on an i386 from 1990. Imho this could be due the new
gl caching mechanism. ( offline draws for scrolling )
Have not tested Blender in all regards atm. but my MacPro 5.1 ( 2010 ) with
AMD 7970 + 5870 is fine else.

EDIT: watchout for windowserver messages in console log pls and paste here.

Jens

Henk mailed me private for help too, but I cannot add anything sane to this.

The iMac here (AMD) and the MacPro (new) do fine.

The user preferences for buffer swap should just be on "Automatic".
Try Blender in factory settings. Set it to factory, and then save the settings, and quit blender and restart it.

Or go to ~/Library/Application\ Support/Blender/ and delete the directory with the name of the last version. This makes sure no old settings got copied over.

I deleted everything in the mentioned directory. All the old settings are gone. First impression was OK, but after making changes (project about 450mb) it is not smooth anymore. After changing settings: (2D Texture versus Draw Pixels) it works again until I make changes in project.

Should I now address this to Apple as a hardware problem?

This sounds indeed a bit like a HW problem either RAM or VRAM related.
If you enconter this phenomenia with other memory intensive SW as well,
i would be pretty sure it is. Atm. the information is a bit poor to finally judge
but i propose to check the machine at least.
Your report is rather untypical although all out compared machines work
but have not the D700 gpu's afaik. Still could be a rare driver thingie.

My personal guess is hardware too indeed.

EDIT: you still did not mentioned your OS version....

Jens

Thanks, will check with Apple to evaluate graphic card.
I will give OS version tonight. I thinks it is 10.9.5.

Your report is very not typical, but you should give much better technical accurate information.

Like:

After changing settings: (2D Texture versus Draw Pixels) it works again until I make changes in project.

That is not good information. It should read for example:

• In user preferences, i set "2D Texture to Draw Pixels", save user preferences.
• redraw speed then is better, until I edit XXX using tool YYY and it is slow again.
• when I save the blender file, and load it back, speed is good agan, until I use tool YYY again.

However, you should not have made that user pref change in the first place. Factory settings are good for testing this issue. You do something that makes texture draw slow. What is that? Maybe you just do things that go beyond the capability of the system, using texture images of 10k x 10k or so?

You work with technology and that is nearly always predictable. Errors you have are due to something you do. Find out how to make it predictable. Then evaluate your actions, skip steps, simplify it, until you have the issue.

Good news! We changed in the user pref anisotropic filtering settings to 2x and VBO's checked. Then everything functions like a charm.
Thanks for all your help. :)