Hey All, I could really use any help / advice or just a point in a good direction. Our Xenforo Install is having these massive processor spikes and I can figure out what is causing them. Here is what it looks like: I have 4 Large AWS EC2 systems running where I only had 2 before. I can say that all of this started roughly around the 30th of September. Here are our Forum's Stats: Heres what I have Looked at and tried: I have interviewed everyone on the staff and everyone has been working on other projects that do not concern this Xenforo install. I have assumed that maybe it was a plugin and have individually turned each off one at a time. Looking at the spikes it looks cyclical so I though may cron. I disabled the hourly & user upgrade crons. I also edited the specific cron files and commented out what they did. I have checked the Xenforo Server Error Logs but I only saw 2 errors: An there are more spikes than there are errors, so I have ruled these out. I have looked at the php error log and did find a couple of these: which makes me believe it is something that involves the Database. However I have not had another one in a day or two and the spikes still occur. I have gone into the DB and Repaired all of the Users Tables, The xf_session Table, & the Threads Table. We have just (as of last night) upgraded from 1.1.3 to 1.2.2 (Hoping this would solve the issue) and I did notice that with the Board deactivated the spikes subsided but the Instant (and I mean instant) it was active again; the spikes immediately returned. This makes me think that it is not anything malicious since it was so instant. It makes me feel like it is some internal process. I an currently going to collect all SQL queries to see whats going on there. I will post a section of those as well. With all of that being said. Would anyone know of anything cyclical within the Xenforo system that could do this. A possible theory I have at this point is that a Table may be too big or got to big around the 30th and some natural process with Xenforo now has too big of a job. But I don't feel our Forum is that big.