No, this is a relatively new system. However, when boot time increased 14 seconds and loading time of menus and applications increased by about 10% I naturally assume more resources are being consumed.
Check your log and temp files...if they get too big your system can slow down. You might have to setup a script to run in cron so files like that don't get too big.
I've gotten a lot of information from unix.com. There is tons of stuff there.