I'm shocked that nobody else has reported this problem. I have one client, out of 200, who has this issue constantly. When opening an estimate, the page takes too long to load and issues a message that the page is unresponsive.  We have opened his QBO file on different computers, with different browsers and different users and the problem is consistent. Clearing the cache does nothing. Adding qbo.intuit.com to the allowed popups does nothing. Using an incognito window does reduce the wait time of the unresponsive page, but there is still a wait time. Are there any new ideas on how to correct this problem?