Hi all,
I'm having a very similar problem, but when enabling debug mode the update becomes immediatly fast. The difference is big: ~24 seconds vs. 600ms for the update XHR call. How does it's possible? Maybe some module is disabled during debug?
I tried, when in non debug mode, to disable all non Prestashop modules, but nothing changed.
Prestashop v. 1.7.8.7, php 7.4 and mysql 5.7
Thanks a lot
g4b0