https://bugs.kde.org/show_bug.cgi?id=361546

            Bug ID: 361546
           Summary: The brushes have become  really slow in recent 3.0
                    alpha builds compared to their 2.9 counterparts
           Product: krita
           Version: git master
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: Brush engine
          Assignee: krita-bugs-n...@kde.org
          Reporter: raghavendr.ra...@gmail.com

I have noticed that some brushes have become really slow in builds ( probably
after the Vc  1.2 transition) first  i thought this may be because the brushes
had complex tip, but then i chose basic brushes like Basic-tip-default to test
. I tested the same brushes in 2.9 and 3.0 with same settings. I have not
enabled instant preview to test the base speed and not the preview (Note below)

The results showed that there is a noticeable speed difference in basic
brushes, you can check the screen capture here ->
https://dl.dropboxusercontent.com/u/37777793/new-lag.mp4 
(I will attach this video to this bug report too)

as you can see at the end of video the 300px brush takes too much time in 3.0
while the same brush with same size completes the stroke way before it gets
completed in 3.0  

Now the reason to disable instant preview was that I wanted to see the
difference in real stroke and beside enabling instant preview gives on more
side effect since the brush takes too much time to load the stroke is not
finished in the background and it really hampers painting , often if you paint
something and then decide to delete or clear the canvas after 3-4 sec krita
hangs a bit as the stroke is still rendering in background.

Reproducible: Always

Steps to Reproduce:
1.Open krita create a new document switch off the instant preview ( this is to
notice the actual speed of the brush)
2.Choose brush basic -tip-default and adjust the size above 120px
3. drawing on canvas with a reasonable speed

Actual Results:  
the brush stroke takes too much time to complete even if it is normal basic
brush 

Expected Results:  
The performance of the brush should be onpar of what we had in 2.9 if not
faster than it .

Pardon me for setting this bug to major as this hampers the painting process
and I think this shouldn't go unnoticed , if you feel there should be a lower
priority to this report please change it.

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