So, reviewing some other digital softwares notably Autodesk Sketchbook and Medibang Paint Pro, it seems that, with even with low brush size, the brush rendering tends to happens in real time and I’m wondering why. I’m wondering why compared to Krita or Photoshop it’s a different story. Basically, Clip Studio Paint, Medibang Paint Pro, Jump Paint, Autodesk Sketchbook, are a range of softwares which can offer realtime performance with a simple round brush that has 10% spacing on an A4 canvas at 600 ppi. You just need to fit the whole page to the screen and draw fast on it to see the result for yourself. But, just, why is it faster with these brothers ? I wonder…
I might ask them to see if they’d be kind enough to tell me about the software tech they use. 
Have you tested the Basic-1 brush in Krita? It’s the only preset that uses the quick brush engine and is very performant at large sizes. It has very limited options and doesn’t have pressure sensitivity though.
The engine itself does have pressure sensitivity at least for size, btw.
Oh yeah! Sorry - I was only thinking of opacity! 
No GPU you already know this.
I don’t know. Krita’s brush was definitely slower then those you mentioned in the past but it has caught up with that(especially since it’s multithreaded), and depending on the case even faster now.
And in case you’re referring to the delay between the cursor and the brush outline, it’s due to window’s areo display option and does exist across all painting applications as well(as far as I’ve experienced). I really hate that delay but Microsoft made it unable to turn it off from Win10. : /
If you want to be more productive on this you gotta be more specific about the problem you’re having or the comparison.
I agree with OP. Even Drawpile have more responsive brushes (comparing their simple brushes to krita)
I did lot of digging in past and i found something that improoves Krita brush speed:
I agree that with small brush sizes, Krita renders much faster compared to before. 
En, the difference in terms of speed is quite negligible. Krita is only a few hundreds milliseconds slower, and you can feel how fast the brush catches up. Well, still… that real time performance from the brothers is particular… Oh, well.
I still don’t see there’s a speed difference, but I did find that brush rendering stutters at the start of every stroke(in 5.0 nightly). I think dev is working on that tho.
Why did you post this in the #lounge ? Please post in appropriate category.
I think the stuttering issue is still observable in the nightly build. (Renderer:opengl)
It seems like the stutter happens the most at the very first stroke on the canvas, but it gets better after that, but still there. Odd behavior.
I really hope small basics like this is fixed in the official release.
Since this topic was brought back up, I’ll just note that if you fiddle properly with krita’s brush engines you will get the speed, for example new paint tool sai v2 can do basically real time blending painting brushes of 1000px size on a huge canvas on my ancient machine, krita can actually do it too but the preset brushes are not set up for it so you just need to make adjustments to the brushes.
It’s similar with the issues above, for me I use a canvas about 10k res and I can certainly draw just fine even with smaller brushes it’s just that you need to tweek some things here and there since there’s a lot of customization available.
Thought blending particular is something that I remember one of the devs say might need more work in the future.
Any tips on what to tweak in particular?
That’s based on what you need the brush for, just spacing alone does wonders but there’s more. For example 10k x 10k canvas doesn’t really need a 1k px brush with tight spacing and details and such so I tweaked it to make it work real time to fit my needs 
As observing other applications it changed my opinions a bit. The ‘delay between the cursor and the brush outline’ seems to be fairly higher in Krita compared to the others. (If you switch to OpenGL renderer it reduces the delay a little, but it’s still higher) Plus the brush outline movement on the canvas is less smoother, in terms of framerate or something else.
I don’t have much of a problem with this personally and I don’t think it’s an urgent issue but it definitely seems to be true that krita’s brushwork is less responsive and could use some improvments in the future.
I used 5.0 nightlies btw.
For me personally, the 4.0 version felt not responsive enough to consider using Krita (coming from Sketchbook & the Adobe suite), especially with larger brushes and I only touched the defaults a year or two ago. I have yet to get work done on 5.0, so can’t really comment on that, yet. Though medium-large 1000 px waterbrushes in Photoshop can also grind the program to a standstill, depending on the particular brush chosen (the built in Kyle Webster watercolour’s has quite a lot of those).
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