But you did. In 2.8 release version everything is ok again. So, one the one hand, of course thank you. On the other - you haven't tried to fix this problem and it was fixed occasionally.

Thanks for the report, but you are manipulating several high-res textures on an integrated GPU from 2015, without even its own dedicated RAM… Not to mention that Apple gives very limited (to avoid saying nonexistent) support to OpenGL these days. So am afraid we cannot do much here, this is the price for having modern shading capabilities.

Jean First, yours is not exactly a control experiment. You're using an experimental build (2.81) but more importantly testing on a different model iMac with the AMD Radeon R9 M370X, which has twice the RAM (2GB) of the Radeon HD 5750 (1GB).
Further experiments with procedural materials on this model iMac lead me to believe that Blender 2.8 requires minimum a 2GB video card, as after a certain point in the node chain (I have not yet documented where exactly) Blender 2.8 crashes in LookDev/EEVEE but not in Cycles/Rendered.

rB2b9f4bcfa07046c2485db4d9cc2bc465c2582d39

Hi, Just wondering if you guys have plans to fix this problem with the alias folders not showing up in blender file bowser. It does not work on 2.8 and I tried it today on the new 2.81 and it still does not work. It would be really great if you could fix it.

I discovered something interesting that may or may not be helpful for those debugging this issue. Through a series of appending collections to another scene, I'm able to view Chuck's box without any performance issues. Here are the exact steps I performed:

It is still a problem for me on 2.81.

I have the exact same problem on my iMac Pro running Mojave. As soon as I adjust the metallic setting in my Principled BSDF element to anything other than 1, performance of the viewport goes from extremely fast to extremely sluggish (unusable).

I can confirm this bug on OSX 10.12.6

I cannot reproduce this on OSX 10.12.6

Thats because you are not using a Mac with a Vega video card. Its been confirmed on another thread that its a Vega specific issue.

I cannot reproduce it on OSX 10.12.6

Not sure this is the only problem, but this is a simple example file for the crash:

I cannot reproduce this on OSX 10.12.6

After a closer look I was able to reproduce it (somehow) in the viewport with the file . See also my system specs above.

I cannot reproduce this on OSX 10.12.6. The textrure painting and floodfill feel slow, but zooming in and out works well enough. Could be related to the nvidia driver.

I cannot reproduce this on OSX 10.12.6

Is this related to T65714 ?

Hi there I have never posted to this, but the problem above is plaguing me on 2.8. I saw you couldn’t replicate it, but for me it’s if I have animation and I pinch to zoom in the any timeline or graph editor. It will crash. Without animation it won’t. It will just zoom infinitely in until the timeline or graph editor or whatever is unusable without resetting the zoom from a menu.

After trying to create another procedural texture, in LookDev/EEVEE Blender crashes. I suspect it's not a bug per se but possibly my iMac Mid-2010 (not exactly cutting-edge hardware any more). Again, while working in Cycles/Rendered everything works as expected. Attached is the crash log and the .blend file.

Glad to hear, closing then...

Blender 2.8.1 build now has Python 3.7.4 and the BlenderGIS add-on now installs. Thank you.

Wait for buildbot to be able to build new one, it should have the new one.