I can share some information that can help you fix this delay, marsha-maillet-a.
I've got some steps to help fix this issue. First, you'll have to sign in to your QBO account using a private browser. This helps isolate the issue since it doesn’t store data in the cache. Here are the following keyboard shortcuts:
Check this article for more information about the system requirements for QuickBooks Online and other things to do to improve the performance of your browser: Why is my QuickBooks Online slow?.
As always, I'm only a post away if you should need further assistance. Best regards.