zfs, a directory that used to hold lot of files and listing pause

[Andriy Gapon]

Instead of the guesswork and black magic, you could try to use tools to analyze
the problem.  E.g., determine if the delay is because a CPU does a lot of work
or it is because of waiting.  Find the bottleneck, etc.
pmcstat, dtrace are your friends :-)

-- 
Andriy Gapon