I have built numerous businesses and websites with chicken scheme. It rocks.
The largest one is a basic CRM for a small niche. It runs super fast and development was a breeze. I run it compiled with a number of optimizations enabled.[0]
My personal website is also built in chicken scheme and runs fast even though it is running in interpreted mode.[1]
[0] https://a.keeptherecords.com/demo, source code: https://github.com/ThomasHintz/keep-the-records