No, not if installed correctly. If site speed is a big concern and you’ve got other essential JavaScripts loading, just place Rating-Widget right before the closing body tag </body> It doesn’t care if it’s last in line, and this way it won’t slow you down.

Check out if you have any active caching plugins in your WordPress, they might cause this affect. In addition, we use local caching which is updated for every 5 minutes to increase the plugin performance.