Unfortunately, these stock standard trouble shooting options are of no use at all. I recommend calling and complaining and refusing to do what they are offering...
I think it's fairly obvious the slowness is not down to individual customers' computer or internet set-up. If this many are having problems (and those of us tha...
We're having exactly the same - Quickbooks seem to want to make it a browser issue but we have tried different browsers (initially Edge, then when that slowed d...