Major brush lag even with low (~30%) smoothing

[Sling_Shot13]

Photoshop CC 2018, fully updated (upgraded to 2018 and downloaded recent update from early April/late March)

OS X, fully updated

iMac Retina 5K

16 GB Memory

Allowing PS to use 9998 MB memory (recommended: 7851-10278 MB)

Hello,

I hope someone can help me. My brushes have very noticeable lag even on low smoothing (around 30%). I'm using the basic PS brushes, and Kyle T Weber downloaded packs. I work in 300 dpi resolution and the lag is present when the brushes are small (8 px) and also when large (100+ px) but only when smoothing is on. Zooming in or out doesn't seem to make a difference. The lag appears around 25% smoothing and gets almost unusable around 45% smoothing.

Is this normal?

I'm using a fully updated Wacom Bamboo drawing tablet (it has the latest drivers, which are old, but I get the same problem with my mouse, so I don't think it's my tablet)

I have already tried the "reset preferences on quit" fix as recommended elsewhere on Adobe forums.

Please let me know if you have any suggestions, or need more information.

Thank you!

[Sahil.Chawla]

Hi,

We're sorry to hear about the performance issue when using brushes, could you please try deselecting "Use Graphics Processor" located under Photoshop's Preferences > Performance, then relaunch Photoshop and let us know if it helps?

Regards,
Sahil

[Sling_Shot13]

Hi Sahil,

Thank you for your response.

I unchecked "use graphics processor" and restarted Photoshop. I was using a Kyle T Webster brush at 250px and the canvas was 300dpi.

The brush still lagged horribly. I could count the seconds it took to complete a stroke.

Please, if you can offer anything else, I am happy to try it. At this point, this is terribly affecting my workflow and I will have no choice but to look into how to downgrade back to PS CC 2015.

Thank you again for your suggestion.

[Sahil.Chawla]

Thank you for providing the information, could you please try enabling the root user account on your mac and let us know if you experience a lag in that account as well?  Steps to enable root user: How to enable the root user on your Mac or change your root password - Apple Support

[PECourtejoie]

Hello, can you provide the first part (cut before the plug-ins) of help/system info...

[PECourtejoie]

Bump, any change, is it working now?

[Sling_Shot13]

Brush smoothing is still slow, but I haven't needed it much since upgrading my tablet. 

I haven't had a chance to try it in the root server, but the last time I had a similar PS brush problem, the issue worked fine in the root server. I have to re-install PS in the root server to test it, and restart my computer several times. I just haven't had time.

[PECourtejoie]

Hi, what do you mean by the root server? Are you working in a virtual machine?

[Sling_Shot13]

Hi, I'm not sure what you're asking for. Can you give me step-by-step?

Thank you!

[PECourtejoie]

In Photoshop, go the help menu, click on system info...

Copy, paste here in the forum.