P: Healing brush & clone stamp tools lagging

This worked for me as well! Strange Adobe can't fix this, since the problem has been there for some time. I had to sell my MacPro because of dead pixels after Liquifying. There was an issue with the particular GPU, and they never fixed it. And now I bought a new packed MacBook Pro '15, and this problem appears. I often use my rulers, so I constantly have them visible.

it worked for me too! thanks! 

Separating out to its own issue

Please reference the new conversation here: Photoshop CC 2019: Painting lag (with and without rulers show) and tool focus iss...

Jeffrey, In the last update my settings were reset and now when I go to a tool (e.g. lasso), the focus doesn't automatically go to the tool preset panel / window, and also when I click on a curves adjustment layer the "Adjustments" panel doesn't automatically come to the foreground. Can you let me know if I can change a setting to fix this please? I have these windows / panels open all the time in one tab group (Properties, Adjustments, Tool presets).

Crash is separate issue being worked on with Apple

Please reference the new conversation here: Photoshop: Crash macOS (bucket 4438168)

Photoshop seems to be permanently broken now. The fact that these issues have gone on for so long is inexcusable. Even simple issues like the save for web settings not saving each time you close Photoshop. Not fixed. It's been what, 3 months now? And now Photoshop has started randomly crashing in the middle of Select & Mask. Happened 3 times already. So much time lost.

It just crashed for me again, and every time I submit a crash report. And every time I include my email address. So no idea why you don't see them.

Hi Jeffrey, I'm using a Wacom tablet. I'm not sure the rulers are affecting it much.

Hi Jeffrey, I'm using a Wacom tablet. I'm not sure the rulers are affecting it much.

@1907153 Sounds like you might be seeing a different issue. Is the performance just as bad or worse with Rulers on? Are you using a Wacom tablet or another input device? We may want to break your issue off into a different thread to address.
@3313111 The Save For Web issue was caused by a change in Mojave. These OS issues sometimes take longer to address, sorry. In terms of your crashing issue, I'm not finding a crash log submitted with your email address. If you can submit a crash log with your email address, it could help me track down what might be wrong: https://helpx.adobe.com/photoshop/kb/submit-crash-reports.html

I agree. Photoshop seems to be permanently broken now. The fact that these issues have gone on for so long is inexcusable. Even simple issues like the save for web settings not saving each time you close Photoshop. Not fixed. It's been what, 3 months now? And now Photoshop has started randomly crashing in the middle of Select & Mask. Happened 3 times already. So much time lost.