IMac much faster after logging out and back in.

Last week I installed a piece of software that required me to log out then log back in for it to take effect. After logging back in I noticed that my iMac was running substantially faster than before. When I went to reopen Safari and Mail the applications just appeared with barely a bounce in the dock. Normally my iMac runs OK, but this is noticeably faster.
When I reboot an am automatically logged in I get the same OK performance, but if I log out then log back in I'm right back to running very fast.
Does anyone know why exactly this happens? Or if there is a way to keep from having to log out then back in again to reap this benificial performance?

Yes, it does release memory, Diane, but what is puzzling is that there is absolutely nothing that logging in and out accomplishes that a restart wouldn't also do. I don't doubt that his system is faster, but I don't know why that would do more than just shutting it off and turning it back on again, which is where the mystery lies.

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