Even with @Airy's fix (which you should do!), I think you're still going to find it slower than you'd like, and that's due to this item in the 11.0.2 release notes:
- Worked around an issue when setting window position and size when the system is animating the changes and gets confused.
This change was made due to a bug in macOS; there's a fair bit of discussion on it in the forums; this thread is probably the most relevant:
Included there is a Terminal command to disable the change (an added delay), so you might try that.
-rob.