I'm here to help you in fixing the performance issue, sf5.
QuickBooks Online is a web-based service which means it depends on the device and internet connection.
Let's make sure that the browser you're using is updated. For Google Chrome, go to the Chrome menu and select Help, then About Google Chrome. Aside from the browser, I also suggest updating the operating system. In addition, low internet speed can also cause lag issues.
Please check these links for more details:
I'll be here if you need more help. Stay safe!
