Hey, thanks for your reply. Here are my answers:
I can reproduce this issue by opening the site from my read only link in the opening post and then switching to another application or browser tab. As I alternate between modifying elements and switching between applications, gradually Webflow comes slower and slower.
The slowness presents itself in the form of:
• Lag while scrolling
• Drag and drop of moving/adding elements not working properly due to lag.
• Switching between panels (Navigation, Styles etc.) becomes slow.
• Setting styles and attributes becomes slow.
• Switching to pages becomes slow.
I’m using Safari 11.1 on Mac OS Sierra. But in Chrome 65.0.3325.181 it’s the same.
Important: I get these problems especailly on more complex sites. Especially on pages with a relatively high number of DOM elements ( > 800/1000). Also I have a lot of collections in this site, with a lot of fields and references to other collections.
Hopefully this information helps in tracking down these issues.