Dear WordPress developers. Your work is amazing and appreciate everything you do but this is a rant about the design decision when viewing the template list in the block editor is crazy. My editor loads 17 iframes with all template content in each as if it were a mini version of the template editor page. The number of resources this loads due to block assets being loaded, images, css, and javscript files is beyond excessive. Every time I toggle to view the list of templates it slows my browser to a crawl for 1 minute before its usable. I have a pretty powerful machine so I can only imagine what others are experiencing. Please re-work this. Its almost unusable. A screen shot of the template when I save it could be used instead of loading iframes with all content.
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At the very least you could have kept the iframes hidden while Im working on a template and then reshow the same ones when i toggle back only updating the one i last worked on rather than loading ALL OF THEM again each time i toggle back.
I have a site I’m working on with over 50 templates and doesn’t have this problem.
Do you have access to another site to see if this is unique to your setup?
That does sound awful though!