Local scriptingAPI works so slowly in unity2018!

I often use unity2018 offline.When I open Help-->Scripting Reference ,searching some API in build-in documentation,I find it works so slowly.I try to delete "google" sentence in .html files like doing in early unity version,but it is still no useful.How to make local documentation's page transitioning faster?I'm not good at html programming,but I think there must be someway solving this problem.Need your help!