Thank you so much for this post!!! It will help me a lot. File Explorer response seems to be much improved.
Performance is nearly instantaneous when navigating local folders and folders on OneDrive.
While performance for has been greatly improved for SharePoint synced folders, it still takes 3 seconds ("1-one thousand, 2-one thousand, 3-one thousand") to open a folder there. The Preview for the Windows update says, "Addresses some issues that affect File Explorer’s performance when you browse for files and select files.". This makes me think that there are more issues to be corrected to get back to the performance from Windows 10.
That said, I am very happy they have turned a crippling problem into much less significant (but still important to fix) performance hit.