Hi Richard,
Thank you for sharing your experience with QuickBooks. I'll provide details about why a user experiences such a thing.
A poor internet connection is one of the causes of having slow QuickBooks. Please check out your internet speed to see if it, at least, reaches 3 Mbps. Another reason is not meeting the system requirements. Please check this article for more details: Why is my QuickBooks Online slow?
On the other hand, you can also clear your temporary internet files to free up your browser's cache. Here's an article for your reference: Clear cache and cookies to fix issues when using QuickBooks Online.
If you have any other concerns, please don't hesitate to go back to this thread. Take good care always.
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