It happens too, if you want so serve larger videofiles with jester (I made videotags for html).
If you get a lot of requests for big files, the memory consumation will grow. After a while the gc kicks in and cleans out the memory, but if you're not lucky it will do no good to your memory, and jester will die. I monitored that while coding an inhouse tool. I switched for that to: logic (html generation, routing,...) jester, files for it on an spare apache. I used jester for the logic in the end, because i coded a lot procedures in nim for it. For a later project I switched to Racket and rewrote all of it there.
