Last year when we started this thread, we thought we have the issue resolved by blocking CefSharp.BrowserSubprocess.exe via local Group Policy as well from antivirus. The response from our initial question was that CefSharp.BrowserSubprocess.exe was not part of Quickbooks. So we went ahead to block it. 

Then we upgraded to QuickBooks Desktop Premier 2023, this is when the issue resurfaced and Quickbooks will not launch at all with "unrecoverable error". 

It's ended up costing us more than $10K to work around it. We migrated our QB 2023 to a new physical server with dual Xeon 24 cores CPU and 128 GB of RAM. With the amount of cores, we had to purchase 3x of Windows Server 2022 licenses. CefSharp.BrowserSubprocess still use up lots of resources, but physical server has enough resources to handle for 5 users at the same time.