I am having the same issues also. I have been using QB Pro 2011 for years without any issues. I was forced by my accountant to upgrade to QB Pro Desktop 2021. It sucks big time. SLOW.

VEERY SLOW. It takes over a minute to open. WHY?

What could it possibly be doing?

Uploading my data to a server somewhere?

I don't like the feel of it. It seems to be connected to something in the cloud.

My old version was MUCH snappier and more responsive. THAT is the main reason I didn't upgrade for so long. Every time I upgraded, the software got bigger and bigger, slower and slower. I cannot stand this new version.

I called in to "Tech Support" and tried to speak with someone with a very strong foreign accent. This language barrier only made the situation worse. He tried all of the usual fixes and blames mentioned above to no avail.

He then wanted to install some remote viewing software on my system so that he could control my PC.

NO THANKS.

This software has an OBVIOUS issue. Everyone I have spoken with is having the same symptoms.