Thanks so much for the very useful information, we helped a customer recently to improve his site’s front office performance by cleaning those tables. We didn’t think it would help the back office performance too, it’s probably related to those statistics blocks on the dashboard page.
Don’t delete the layered_filter_block module, it’s for the filter module.
Check this https://www.sunnytoo.com/70029/free-clean-database-module-prestashop-speed-store we just released a free database cleaner module.
We will soon release an advanced one to for fully clean up usage.
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