I first like to say I really like this plugin. There is only one problem that makes this plugin unfortunately useless to me: it really really slows down my site.
I have been testing it for over a day, and at first I didn't understand why my website was extremely slow, till I found out it was your plugin causing the trouble. I'm talking about a slowdown of between 5 to 10 seconds of loading time for a simple page containing nothing more then text.
I am not sure why it is slowing my site down. I tried disabling the counters you recently added, but that did not solve it. I embedded the code in my template files, so it shows up where I want, so I thought that might be it. But removing it and using the shortcode instead also did not solve the problem.
I really dislike it because I really like the plugin, but this way I can not use it. I hope you can find a fix for this.