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[Fixed] Performance degradation when using Windows Display scaling

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There seems to be an issue with how Affinity Photo handles display scaling in Windows. With scaling applied, there is a severe performance degradation when using tools. I've recreated this on two computers and in both the release version and beta using a 4k monitor under Windows 10 x64. My primary PC is an i7 2700K, 16gb RAM, & GTX 1080 gpu.


To most easily reproduce this:

- Set Windows Display scaling to 125%. Logging out is not needed to recreate this issue nor has any impact.

- Launch AF and open, for example, the Space Dock demo file

- With the whole canvas visible, create a new pixel layer on the top of the stack and use the paint brush to quickly scribble around the image. 

- Note the laggy, stuttering performance of the brush.

To compare:

- Close AF and set Display scaling to 100%, again logging out is not needed.

- Open the same file and repeat the test

- Brush tool is now smooth and seamless while painting.


Can anyone else recreate this issue? Any ideas on fixing it?




EDIT: Added short video clip to demonstrate - first at 125% scaling, then 100%. Note cpu usage difference. Larger display scaling values seem to further increase cpu usage.

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Glad to hear it! Thanks for looking into this issue - really appreciate the continual improvements to Affinity. Keep up the great work!

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