A few seconds after every brush stroke, "Updating..." appears in the lower right. If another stroke is started while that message is present, the stroke is delayed for a second or so before it appears. If the next stroke is drawn before the message appears, there is no delay. Reproducible: Always Steps to Reproduce: 1. Disable OpenGL 2. Make a new image 7000 x 4500 3. Select any brush and draw a scribble 4. Wait until "Updating..." appears, and then try to draw another scribble before it disappears. See that there is a significant delay before the stroke starts. This is reproducible in Windows 10 with a mouse or tablet on a Quad Core desktop PC with NVidia GeForce 9600GT, but I was unable to reproduce it on a Surface Pro 4.
I now find this is reproducible on the SP4 in krita3-prealpha3-de0d43d . "Updating..." appears much more briefly than on the desktop, but still interrupts the stroke.
Unchecking 'Enable progress reporting' (Configure Krita -> Performance) may solve it.
That does appear to have made a slight improvement, however strokes are still delayed frequently. Sometimes after drawing several quick strokes, pausing for around 5 seconds and drawing another stroke there is a delay, and then drawing a stoke every 2-3 seconds thereafter causes a delay every time.
I think we should disable instant preview completely if opengl is disabled.
To be clear, the interruptions occur irrespective of whether Instant Preview Mode or OpenGL are enabled.
Hi, Chris! Thank you for your report! It seems like our animation cache generator starts updating stuff even when you don't have any animated layers... :( I will try to fix that.