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Hi @Caroline Harper

This is the fastest way to identify the problem.

Advanced Parameters → Performance → Debug Mode → Enable Profiler

Then load:

• Orders list
• Product edit page
• Modules page

Look specifically at:

• Slow SQL queries
• Repeated queries
• Hooks executed on BO pages (displayBackOfficeHeader, actionAdminControllerSetMedia, etc.)

Modules that inject logic into every admin controller show up clearly here.

Disable profiler after testing.

2. you can disable one new module and see if problem goes away, if not enable and to the other modules you installed.  If the shop starts to behave as expected after a disable contact the developer for assistance.  

I hope this helps get you started with analyzing your PrestaShop environment. Once you begin profiling and isolating modules, other contributing factors usually become much easier to spot.

Fred