Prestashop Peformance/Speed

In general, I think it is the limitation of the theme
 
Former user here. I used it for a little time but honestly speaking, I can’t say that I saw a dramatic improvement on Google PageSpeed Insights. Maybe the theme I was using was a little bit faulty but in general relying on "speed" modules or extensions for performance and speed is not really the best choice. A lot of those “performance” extensions are buggy and causing troubles even with a small catalog and few modules.

Webp images coupled with Redis + Varnish caching is a much better choice.
 
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CloudFlare is doing great job with prestashop, I recommend to connect your shop to CF.