Since version 11, dopus has become so slow at moments.
My default lister shows my computer, and my Synology NAS.
It takes forever, or dopus chokes completely on displaying that lister.
When I look in Proces Explorer, I notice "dopuslib.dll!DummyDllFunctionToAvoidSymbolConfusion" takes a lot of resources.
I don't know, but it's worth a try to disable the shell extensions which are part of it as a first step, in case that's all you need to do. They've caused a couple of different problems in the past.