When you make few fast strokes in succession first one is rendered with quite big delay. Next strokes fallowing it are rendered normally, but if you wait around 3-5 seconds and make test again first stroke after pause lags again. Instant preview mode doesn't help. For now tested only on Windows with Wacom Intuos Pro. Will try on Linux machine soon.
Do a bit more testing and also provide your system specs. I am not experiencing any lag on my first stroke on my Windows 10 box. I am on a Huion tablet right now. Does it matter if it is with bigger or smaller brush sizes. Does it is also matter if you are zoomed to 100%?
Oh. Tested on Photoshop and Gimp no problem there, so it's not hardware problem.
Lags on even really tiny brushes, same on big ones. Tested with: - Quick Brush - Pixel Brush - Smudge Brush - Sketch Brush Specs: Intel Core i7-2600 3.4 GHz, 16GB RAM, nVidia GTX 750
Sorry for too many comments xD I've tested with different zoom levels. Nothing changes between 17-100-400 %.
Can you explain how you are testing? What brushes are you using...and how long are you waiting between strokes to get the "first" stroke?
Image A4 300dpi, b)_Basic-1 40px, waiting around 2 seconds. First stroke looks like tiles are refreshing slower than they should, if you make next stroke right after "first" they don't have visible tile refresh lag. Tested also with normal mouse same problem so it's not input dependent. :)
Thanks for the info. Someone else is going to have to test this. I can't seem to get this lag on my machine (which is quite a bit less powerful than yours).
Ok. I understand although I have new info I guess xD I've tried to change Krita setting trying to find something. I tweaked "Performance" settings in "Advanced" tab I turned on performance stats and turned OFF "Progress reporting". And my lags disappeared xD I've tried turning "Progress reporting" ON to check if it was a culprit but turning it ON or restarting Krita didn't made lags come back. Technically my problem is fixed for now... I will try to monitor situation and report any new info.
Ahh interesting. That Progress Reporting does say it might affect performance as well. I am not quite sure what it is doing to know why it would affect your computer and not mine though. Someone like Dmitry might have to look at it and give some feedback. Maybe we need to have that setting off by default or intelligently turn it off in some situation.
Okay, let's assign to Dmitry then. But if it turned out to be irreproducible after toggling the switch it might be hard to dig in further.
Alright, I think I've found the solution on reddit: The lag occurs because the wacom drivers have a "Tip Double Click Distance" setting. Put the slider to off and this issue should no longer exist. https://www.reddit.com/r/krita/comments/7cmktc/lag_at_beginning_of_stroke_wacom_windows_10/ First comment.
Closing, this isn't something we can do anything about.