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Another article.. Not mine.. from Microsoft. Good one.

https://blogs.technet.microsoft.com/askpfeplat/2018/09/03/is-group-policy-slowing-me-down/

I do talk about this in super detail in my GPbook.. in the Troubleshooting chapter with more details; but this is an excellent first start.

I also talk about this topic in my talk from TechEd here:

https://channel9.msdn.com/Events/TechEd/NorthAmerica/2014/WIN-B328

And give you some tips and tricks for analyzing the data and making conclusions.

Hope this helps you out !