P: Healing brush & clone stamp tools lagging

@12673783 Bereza: reduced resolution to Full HD reduces lag quite much, although not completely. Yes, im using 4k display from my laptop.
@8075007: I dont use any AV programs, just use windows's own defender. 

@ Du Nguyen
Have you tried/seen the solution I mentionened up here?
Maybe not Spybot - Search & Destroy, but another antivirus programs that's running in the background?

Eduard Clé

Do you have 4k resolution? Could you try lower resolution to fullHD? Just for the test?

I have the same issue with Clone Stamp, it just keeps lagging, unusable. 
I had to install 2018 version to work, which is better but still a bit laggy comparing with my old PC.
I've tried all the solutions mentioned above. None works.
Im using a Hp Spectre 15inch, top specs. 

I am on a windows system and also have been having these problems. I went back to earlier version 19.1.8 to try and avoid these problems and have had to turn the rulers off and also take my cache back to 128, but as I am running Nortons your hint Eduard about security seems to have really sped things up for me, as I have just turned off Nortons and the improvement in performance is like the old days - pre 2018 upgrades.  As I use spot healing; healing brush and clone stamp all the time even though I subscribe I am reluctant to upgrade to 20.0.6. as from what I have seen here Adobe has still not solved this problem.

After more than a week of intensive testing, I have come to the conclusion that I have solved the problem - at least in my case!
The cause was NOT Photoshop itself, but a program that runs constantly in the background: the option 'Live Protection' of Spybot - Search & Destroy. As soon as I disabled this option, the problem disappeared immediately. And not only Photoshop, but also many other programs ran much smoother!

@Adobe: accept my apologies, please! 🙂

@ Jon Faal

It indeed works (much) better, but not completely! I am still experiencing some delays but less frequently.
I presume that Adobe will have to look in that direction to find a definitive solution.

After few days searching how to fix this issue, I finally fix it disabling smoothing in the brush options or turning it to 0.

I hope that it works for someone else!

Same problem for me after updating to CC 2019. 

Healing brush not usable. Windows 10, nvidia 980, i7, high end editing system

Clone stamp tool in the latest release (20.0.5) is simply NOT USABLE. Lags, selecting an area takes 2 seconds, it often does not register at all, it copies from a different spot than selected. It is useless in its current state. 

Rolled back to 19.1.8 - works like a charm. Windows 10.