THE BEST OF THE BEST ANSWER: Roll back or transfer your project to Prestashop 1.6 or run 1.7 on real server.
Because compared to 1.6 presta 1.7 its garbage.
I tell you as a developer who has been working with PS engine for over 10 years and has a lot of prestashop projects at the top of google.
Facts:
Version 1.7 requires many times more server resources.
1.7 сannot be used without maintenance, and should be maintained by an experienced programmer with skills.
1.7 with curves and huge database queries require serious powerful database servers.
Throw out your VPS, VDS and all other services that hosting companies offer, because PS 1.7 almost normally works only on a real server with a powerful CPU and a lot of RAM for the database.
Implementation of a serious large project is impossible at PS 1.7