Note that the main factor in page load times on your end is your internet connection quality and speed.
We take the performance of our widgets seriously, and always aim to optimize them further. The widgets are designed to be as light as possible, and load as quickly as possible.
The load times differ somewhat depending on which widget template you're using. One of our most popular widgets, Review Widget, takes about 200 milliseconds to load (about a fifth of a second), which is imperceptible.
Check out PageSpeed Insights to se your site's overall load times, and the breakdown of different elements.