by Ken Task.
The only thing I see that's strange to me is:
"from dbPHP message: checking plan security"
Do you have CloudFlare or mod_security or securi?
Your screen shot shows 100% but you say around X%?
Large courses will, naturally, use more resources. What are the settings for time for a php script to run, php memory that a script can consume?
And don't forget, cron and task are running all the time. :|
'SoS', Ken