I'll second this!

I learnt this the very worst way possible - having to deal with a suddenly popular web site! The poor webserver had a load average of 20 and each CGI was taking 20 seconds or more to complete ;-) Each CGI took about 1 second to run on an unloaded server, but as soon as we were getting more than 1 per second it exhibited this appalling run away behaviour!

Now-a-days the webserver deals with over 100,000 mod_perl requests per day, and the load average never creeps above 1!

Not everyone uses Apache though (we weren't at the time) which constrains the use of mod_perl (and incidentally is why I stick to Apache::Registry - so the scripts can still run under cgi if necessary on a different webserver).

Has anyone done an ISAPI/NSAPI mod_perl(ish) implemetation yet?