I've been using WordPress Hit Counter Version 2.6 for some time and have really liked it. However over the past few days my WordPress sites have slowed to a crawl with pages taking 60+ seconds to load. I found WordPress Hit Counter Version 2.6 to be the culprit.
When checking the MYSQL processes there were a list of processes with a "sleep" command. Every time a page was requested MYSQL would sleep for 60 seconds before serving the page.
Deactivating the WordPress Hit Counter immediately fixed the problem! Pages load in 1 second rather than 61 seconds with the counter.
Please find a fix for this as I really like the counter.