Performance improvements

[Dunkhan]

Checklist

• [ ] I have included examples or tests
• [x] I have updated the change log
• [ ] I am listed in the CONTRIBUTORS file
• [x] I have cleaned up the commit history (use rebase and squash)

Changes proposed in this pull request:

• Change order that Render() is called

@oxyplot/admins

Please do not merge this. I need to do further testing

[Dunkhan]

Due to the way WPF handles rendering this performance improvement was not successful