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I thought this was a Divi issue, but it just happened when editing a testimonial. I will type or paste text in, then if I want to copy it to put it on another page or into another block, everything will instantly freeze. After a minute, it’ll ask if I want to wait or close the page.
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Just a hunch but it sounds more like a computer-related problem; either your browser or your computer out of memory. Perhaps very low on disk space and whatever it’s using for scratch is causing problems.
I’d reboot and see if it still occurs.
This could be a PHP resources issues. See if you have at least:
max_input_time 300
max_input_vars 6000
max_execution_time 300
upload_max_filesize 128M
post_max_size 128M
memory_limit 384M