Since I’m always seeking to increase speed, I always need new tools to test everything. I use Pingdom Tools and Google Page Speed (GPS) on an almost daily basis. Though those sites are great for testing load speed, I needed something else tested: capacity. Pingdom Tools and GPS only simulate one user at a time, and while it’s nice, it’s not always practical. There’s always a chance that more than one person will be accessing your page at a time.