Hi there, @amandabots. Since you mentioned your internet speed is already fast and the issue is the same across all browsers, that's a good start. Now, let's check your memory (RAM). Having enough available RAM is important because QuickBooks uses memory to process tasks and load data. If your RAM is low or fully used by other applications, QuickBooks can slow down or lag.
You can use this guide to make sure your computer meets the system requirements, and here's another resource to help you check and improve your system's performance: Why is my QuickBooks Online slow?
If you have additional questions, just let us know.