Are you using the page type of “Row” (i.e. the new responsive engine)?
What I found was that when I switched to page type as “Fixed” the slowness immediately went away and when I switched to the page layout is row it came back. Nothing in the network tab, the browser did show the warning about consuming a lot of memory.
Thanks, it still seems to freeze up especially when a couple editor windows are open at once. Dialing back a bit to one tab helps, but I am wondering if there is a bug somewhere that is causing the slow down for this app (as it affects everyone who opens this app).
I reached out to Bubble support directly too. So I should update here if they come back with a solution.