/udoit/lti/authorize/check is slow to respond

[maespey]

We've been running into a problem where /udoit/lti/authorize/check is slow to respond to requests. This is something that is new, starting with our upgrade to 3.3.0, and it varies between a few seconds (shown here: https://uicapture.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=56f9b191-22df-4672-8f35-afbd00fadbcd) and up to ~60-90 seconds which causes our automated testing/alerting to go off and alert staff that the site is down a few times a day. The server is doing fine on resources, and once this request gets a response, the page loads quickly and further navigation is totally fine, it's just this one request that is taking a while.

Logs on the server aren't pointing us in any clear direction, but I wanted to put something up here in case others are seeing this as well, or if there is a known fix that I am not aware of.