Major When run through Jenkins P4-Plugin approx reconcile time is ~15 minutes, the same depot synced to my pc using p4 cmd line reconciles in <30 seconds with -m. I tested the jenkins workspace directly on Jenkins and the amount of time was consistent with the command being run from P4-Plugin. For some reason the sync/reconcile through p4-plug/p4java causes p4d to treat the files as not being modtime synced, so it always chooses a digest comparison. Has anyone else successfully profiled a massive gain from this change?
[JENKINS-30878] Observing no improvement from the addition of the modtime -m reconcile
Paul Allen
added a comment - Released in 1.10.0.
Contains new p4java with modtime support for reconcile.
Paul Allen
added a comment - Released in 1.10.0.
Contains new p4java with modtime support for reconcile. 
http://answers.perforce.com/articles/KB/15133
This article seems to indicate old workspaces would need to be "fresh sync" in order to take advantage of this option.
Since the documentation of the p4 plugin is extremely lacking, I'm not sure even if that would work and you'd have to re-create the workspace altogether (Helix's documentation is almost as obtuse).