I Don’t believe Disabling CEL was mentioned, but Disabling CEL stopped a lot of my crashes on 13 with heavy usage and improved performance. This had to be done from a config file since the setting in advanced settings doesn’t really disable CEL logging.
I read the update to FastAGI in the announcement by Sangoma. I went to Settings --> Advanced Settings, yet I couldn’t find in order to enable it. Can you confirm the location in FreePBX 14?
You have to upgrade to the edge version of the Core module