People have scaled it to over a billion actions per month. No clue how much of that includes customizations though... It sounds way past the out of box limit.<p>Look at the comments from sandfox and afterlastangel in this thread. afterlastangel is pushing a billion, sandfox is around 300 MM per month.<p><a href="http:&#x2F;&#x2F;forum.piwik.org&#x2F;t&#x2F;high-traffic-piwik-servers-database-usage&#x2F;3614&#x2F;71" rel="nofollow">http:&#x2F;&#x2F;forum.piwik.org&#x2F;t&#x2F;high-traffic-piwik-servers-database...</a>