TL; DR - No. Fomo will not slow down your website.
Site speed is a critical component of conversion optimization for ecommerce stores.
We're proud to share that Fomo is about 50kb, and loads asynchronously with the rest of your website.
Instead of typical web elements, which render from the top to bottom of a page, Fomo loads "when it can" and thus does not materially affect your site's speed.
What does this mean?
50kb only takes milliseconds to load on almost all internet connections.
Most Google Fonts (used by tens of millions websites) are slightly over 1 megabytes (1000 kb)
Images (logos, product thumbnails, etc) can be 50kb to 5mb or more (depending on quality and size)
This image below is about 400kb.
To top it off, we use extremely fast and reliable Amazon servers, and an enterprise-tier database.
What about Leverage browser caching?
If you'd like to learn more about how our widget works, read this blog post written by Fomo's lead engineer, Chris.