This test takes 0.25 seconds in 5.4.5 and 6.5 seconds in 6.0

This test takes 0.25 seconds in 5.4.5 and 6.5 seconds in 6.0.0:

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this.ResumeLayout(false) completes in about 300 ms in 5.4.5 but takes multiple seconds in 6.0. this.ResumeLayout(false) takes even longer when there are more event handlers attached to GUI elements (more buttonX.Click += eventHandler calls in DayTradeMainForm.Designer.cs).

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Here is a video showing the test taking 0.25 seconds in 5.4.5:
http://www.filedropper.com/isolator545

Here is a video showing the test taking 6.5 seconds in 6.0:
http://www.filedropper.com/isolator6

Here is the code:
http://www.filedropper.com/testthatisfa ... ndslowin60