You can’t do much about such speed-issues. You can buy the best PC in the world, but since this is an → ONlINE-EDITOR ← (there is somewhere a bigger SERVER running in the background) ← it will not affect your speed!
Instead → WIX ← should UPGRADE their SERVERS (or upgrade the EDITOR) → making it more simple or improving methods and functions on their end, to improve editor’s speed.
All you can do as USER → is → not to overload to much your WEBSITE-SETUP by using to much …
-STATIC-PAGES
-ELEMENTS on PAGES
-VIDEOS
and other heavy data.
I have seen a lot of Wix-SETUPS of different people world wide.
Always when i had a USER → working with to much of Wix-Elements (no code) → the working inside EDITOR was almost impossible → to slow ← because of havy SETUPS (a lot of pages and hundrets of used elements on the page → a lot of useless REDUNDANT SETUP ← because user was not able to code, what is understandable at this point)
Working on sites, which were mainly → CODED ← the EDITORs speed was in a range of → OK <–.