One of the Koha installations I manage has run into the slowdown problem a couple of times. This is on a Linode VPS, not using CloudFlare. In each case I logged into the server and used top to see that Koha was the process taking up all the CPU. Then I looked at this Apache log: /var/log/apache2/other_vhosts_access.log This showed me that it was web crawlers out of control and ignoring robots.txt. Using the IP addresses from the logs, I blocked them using iptables, e.g.: iptables -A INPUT -s 47.76.209.138 -j DROP I realize this is not a permanent solution, but it worked for us because we don't run into this problem very often. I'd have to come up with something better if this were a frequent occurrence. -- What should I do if my problems aren't all solved before I die? --Ashleigh Brilliant