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I'm using a PMS50 GTN750. Loading the flight plan works fine, but when switching between flight plans and map, it freezes for a long time.
I also use the PMS50 GTN750 and not having a similar issue - you might look for other community add ons causing an issue.
I do not see this issue on my system. I would also check if it is the latest version. 2.2.59 is the latest one.
I'm using the latest version of PMS50 GTN750. I've checked all the caravan variants again and I'm having trouble with the amphibious variant.
Not hugely helpful of me here, but I've been using the PMS a lot in the Caravan and haven't seen any problem/slowness at all. Sorry.
As MiRexer already suggested I would start with an almost empty community folder to make sure it is not caused by any other add-on.