Thank you for reaching out on the community and telling us about your issue. There could be a couple of things that can cause loading issues so we generally need to do a couple of troubleshooting steps. I would recommend taking a look at one of our superusers (UKR) posts here in regards to troubleshooting. It's quite a few steps but it does cover a bunch of things that can help us speed up the process when opening quicken.
I would try this out first and then let us know how it goes!