Hello. I found a problem while painting with large canvas size. Brush strokes are so slow, but yesterday when I painted on the same drawing I didn't have this problem. I've followed solutions from https://docs.krita.org/en/KritaFAQ.html#slow-brushes, but none of them works until now. I even restarted and shut down my computer and even resized my drawing to smaller size, but it didn't work either.

This is some information that might be needed.
https://drive.google.com/open?id=1K25xR7qr75GWQRCcUzYMTbgV0jIMGofV

Video: https://drive.google.com/open?id=1F1ic7Qidc5eYzzgo1pq5VjcdJJGBb96h

Thank you, and sorry for my bad English.

Something I've noticed about Instant Preview is as follows:

If you turn instant preview on (and assuming it hadn't been disabled by the auto-size threshold) then it sometimes doesn't work until you change the brush size to any other size (then you can change the brush size back to what you want it to be) and Instant Preview will work. You might want to try that to see if it works for you.

This is also seems to be true for turning Instant Preview off, where it will not turn off until you change the brush size.

ahabgreybeard wrote:Something I've noticed about Instant Preview is as follows:

If you turn instant preview on (and assuming it hadn't been disabled by the auto-size threshold) then it sometimes doesn't work until you change the brush size to any other size (then you can change the brush size back to what you want it to be) and Instant Preview will work. You might want to try that to see if it works for you.

This is also seems to be true for turning Instant Preview off, where it will not turn off until you change the brush size.

Thanks for the information, ahabgreybeard, but unfortunatelly it still didn't fix my problem...

There's something odd going on with the canvas refresh. I can tell canvas graphics acceleration is off, can you turn it on and try again? (Settings->configure Krita->display).

TheraHedwig wrote:There's something odd going on with the canvas refresh. I can tell canvas graphics acceleration is off, can you turn it on and try again? (Settings->configure Krita->display).

It was already on when I record the video. When I turned it off, my brush cursor didn't even move.

That's weird, because the cursor I am seeing is not the canvas accelerated one.

Can you try changing openGL to angle or reverse and see if that works? (Also in the display tab)

TheraHedwig wrote:That's weird, because the cursor I am seeing is not the canvas accelerated one.

Can you try changing openGL to angle or reverse and see if that works? (Also in the display tab)

Changed it, the brush strokes are still slow and lag...

I wonder thought is this kind of problem can be caused by viruses or malwares? I don't really understand so maybe they're the cause?

"... but yesterday when I painted on the same drawing I didn't have this problem."

Something seems to have changed then. If it was a virus or some malware then that would tend to affect other applications too. Have you done anything or downloaded/installed any utilities that might be suspect?

If you're using Windows 10 with a Wacom tablet, it would be a good idea to uninstall and then reinstall your tablet drivers and set up a separate profile for krita using the Wacom tablet control utility. Also, disable Windows Ink in the Wacom tablet utility and at the OS level. (Recently, there have been problems with Windows updates affecting Wacom tablets.)

ahabgreybeard wrote:"... but yesterday when I painted on the same drawing I didn't have this problem."

Something seems to have changed then. If it was a virus or some malware then that would tend to affect other applications too. Have you done anything or downloaded/installed any utilities that might be suspect?

If you're using Windows 10 with a Wacom tablet, it would be a good idea to uninstall and then reinstall your tablet drivers and set up a separate profile for krita using the Wacom tablet control utility. Also, disable Windows Ink in the Wacom tablet utility and at the OS level. (Recently, there have been problems with Windows updates affecting Wacom tablets.)

Well... So there's this virus (or malware? I don't know) called SERVER1.39SLXU3BW.RU. Almost every time I turn on my computer, there's a window written with something about SERVER1.39SLXU3BW.RU that pops up. It's been a while when the window starts appearing, and honestly I don't know how to remove it, all I have is Windows Defender and free softwares. But the Krita problem appeared only few days ago, the day I started this topic. I don't think I've installed something suspicious, but then again, sometimes I can't tell the difference between suspicious and non-suspicious softwares (I know I'm quite bad at computer stuff).

I've updated my Wacom driver and disabled Windows Ink for Krita though, and still those didn't fix my problem.

I guess for now I'll draw on smaller canvas size, but if there's a solution I can try it'd be great!

A quick google search says that SERVER1.39SLXU3BW.RU is a browser hijacker so it shouldn't have a direct effect on krita but who knows what side effects it may have. Be very wary of (in fact, don't) downloading any so called free automatic removal tools. Get a friend or colleague or someone who knows how to poke around inside Windows to use the manual removal process which is described on the websites that give details of this.

ahabgreybeard wrote:A quick google search says that SERVER1.39SLXU3BW.RU is a browser hijacker so it shouldn't have a direct effect on krita but who knows what side effects it may have. Be very wary of (in fact, don't) downloading any so called free automatic removal tools. Get a friend or colleague or someone who knows how to poke around inside Windows to use the manual removal process which is described on the websites that give details of this.

If this is the only way (since I've tried to remove it myself but I failed), then it'll take a while for a result, because my friends who know this stuff are busy for now. And why shouldn't I use those free softwares? Are they dangerous?

It depends how much you trust them to provide software that actually works properly. It depends if you're sure that they don't include 'harmless' advertising material in the downloaded exceutable. Whether or not you're sure that their site has not been hacked and more malware put in place of the 'removal tool' is another consideration to bear in mind. If you're personally happy with all those considerations then you may (or may not) decide to take the risk. Only you can make that decision and accept responsibility for the end result.

Please bear in mind that the reason SERVER1.39SLXU3BW.RU appeared on your computer in the first place is probably because you downloaded and installed some free software from somewhere which promised you something nice.

ahabgreybeard wrote:It depends how much you trust them to provide software that actually works properly. It depends if you're sure that they don't include 'harmless' advertising material in the downloaded exceutable. Whether or not you're sure that their site has not been hacked and more malware put in place of the 'removal tool' is another consideration to bear in mind. If you're personally happy with all those considerations then you may (or may not) decide to take the risk. Only you can make that decision and accept responsibility for the end result.

Please bear in mind that the reason SERVER1.39SLXU3BW.RU appeared on your computer in the first place is probably because you downloaded and installed some free software from somewhere which promised you something nice.

Thanks for the information, now I'll be more careful on installing free softwares.

Anyway, I've followed my friend's solution to remove the virus. Apparently, the brush strokes are still slow ... guess there's really no other choice besides painting on smaller canvas, for now.