Slow Remote App Launch due to CRL Checking - Fix?

Server 2012 RDS Deployment.
Users have been facing slow remote app launches for months, so when they first log-in to RD Web and launch a remote app for the first time, it will take around 2-4 minutes for the app to open.

After spending hours on this , I have found that when logging in for the first time of the day or first time in a while, the Remote Desktop Gateway and RD Broker are trying to access the internet to check Certificate Revocation status using port 80. We do not allow outbound connections to the internet on port 80, so there are around 5/6 processes each time we log-on for the first time trying to reach the internet via HTTP, we then need to wait for these to time out one by one before the app launches.

I have seen this first hand, right after the processes timeout, the app launches.

I have found this document on MS, which seem to suggest to disable CRL checking, but this did not work.

https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/dd883258(v%3dws.10)

I guess my question is, how do I turn this off when using Remote Desktop Services as it is causing a major delay in log-on times, we do not want to open up outbound access on port 80.
I have yet to see a sold resolution to this question asked on technet either.