Poor performance following ShadowAssist.CacheMode change #3616

Bug explanation

It seems that specifically following commit #3616 to change the default ShadowAssist CacheMode behaviour, I find the performance of our WPF app to be a lot slower and laggy than it was before, particularly when it comes to animations such as those in the DialogHost flyouts. It's particularly bad after resizing the window or in full screen.

I'm trying to figure out the best way to replicate the old behaviour. I've tried to set a CacheMode with EnableClearType and SnapsToDevicePixels but it seems like I have to set this all the way down and just setting it on the window or main containing control doesn't work.

Would appreciate any guidance on this. Has anyone else had a similar problem or know the best way to handle the CacheMode property globally? Is that even the right approach or should it only be set for troublesome controls?

Version

5.2.1

首先查看 commit #3616，并在 WPF 应用中复现性能下降，重点关注窗口调整大小或进入全屏后 DialogHost flyout 动画的表现。将 CacheMode 的行为与之前的版本进行比较，并确定该问题是全局性的，还是仅限于有问题的控件；完成的标准是找到可复现的原因，并记录处理方法。