I don't see any point in comparing a production quality web server with python's stdlib web server that is really only to be used for testing. It's not even worth discussing the other issues with this "benchmark".
Bottle uses `wsgiref` (https://github.com/defnull/bottle/blob/master/bottle.py#L263...) by default as its server. Per the name, it is a reference implementation of a WSGI server. No one should really use `wsgiref` for an application they care about. This test is invalid for this and lots of other reasons.