What OS/Webserver/Perl?
DB_File or BerkeleyDB?
What is "do stuff" in
time->attempt lock->do stuff->release lock->get time?
Are you locking the database when you're just reading?
What is takes the longest (attempt lock, do stuff, what, narrow it down)?
I'm assuming that if you have a slow internet connection that the webserver will buffer the output of the script until the client has received the content.
It probably doesn't.
My question is: What can cause one browser/user/connection to take longer to execute a script than another?
Either something related to hardware or software
(disks are slow or you're doing too many things, infinite loop, ... or something).
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