Flickering & "jumpy" animation

[xaviergonz]

This is a great project and I know most dx11 under WPF implementations have this issue, but is there a way to fix any of these two issues:

• Sometimes there is flickering (the rectangle from the sample dissapears for a frame)
• The animation seems to "skip" some frames from time to time for no apparent reason (this seems to happen within WPF itself as well)

[dalance]

I had recognized the issues, but couldn't resolve at the previous implementation.
So I challenge to resolve again.
Thank you