I’m not seeing any behavior like this on my end. Definitely sounds odd.
Regarding performance, it is possible for the Webflow Designer UI to experience slowdowns — mainly on large sites or sites with many styles, pages, and / or complex data bindings.
The team is actively working now on some platform updates to monitor and improve the performance levels across the board. I can totally understand the frustration when waiting in between clicks and I will be standing by cheering with you when the performance levels rise for larger sites.
Some things that can be done now that should help:
Delete any unused classes used on the site from the Style manager
Delete any unused images from the asset manager
Delete any unused page elements from pages
Delete any unused Pages
Delete unused Symbols
Delete unused Collections
Also, the size and number of images plays a big roll in site performance. So if you can, try to compress your images prior to upload so that the source images used in the designer do not have large file sizes.
Here is a good article you can reference around boosting performance: https://webflow.com/blog/how-to-boost-your-sites-performance
If you don’t mind sharing your Read-Only, I’d be happy to take a closer look and see if the team can help.