Absolutely not!

We understand that page load time is important for your visitor experience as well as ranking higher in Google or Bing search engine results. We’ve designed Lasso to load super fast.

We don't load any external scripts and nothing we do has any dependency on the size of your site aside from the initial site scan when you first install Lasso. 

But even the scan will have no affect on your actual website load time.

The entire plugin is roughly 9.7mb zipped, which is the size of two MP3 songs. Or roughly the size of 1/4 of Weezer's blue album. 

In other words, the plugin is small.