[racket] Running into severe scaling issues with plt-web-server

Ok.  I think 40 is much too small as the default backlog size though.
I look at what the defaults are for other web servers like apache, and
the defaults are a bit larger there.  (It's about 500 in Apache's
case):

    http://httpd.apache.org/docs/current/mod/mpm_common.html#listenbacklog