Piwik: sometiems it drives me nuts
Piwik is a stats script like Google Analytics. I love it especially the fact that I don't have to give up my data to Google and it's easy to plug into Wordpress, but sometimes Piwik drives me a bit nuts. When digging around in the stats for a high traffic site, Piwik tends to get a little bit slow. Going through their docs, I found the solution: auto archiving. It works, you should try it.