> It probably wasn't mentioned because it's got a bad reputation as being slow. 
> It's easy to abuse it and end up with crappy performance. As long as you 
> limit the amount of painting you do and how often you do it, I don't think 
> using it is really an issue in practice.
> like Canvas is not the really good solution - just a workaround. That is, it 
> not claims to be "support for arbitrary shapes in QtQuick".

Yes Canvas uses QPainter to render a texture on the CPU, which is then uploaded 
to the GPU.  Besides the drawing commands being in Javascript.

It’s not that bad in practice, just not as efficient as it could be.  You might 
not be able to redraw it at 60FPS.

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