You're an "IT TECH" and can't figure this out yourself?
the OP also said he uses windows, and has for the past 25 years. Obviously they aren't the same operating system, or none of us would be here, they are very different.
To the OP: everyone has their own reasons for getting a mac. personally, I love unix systems (can't stand windows, FYI I'm a windows IT guy as well 3 years, not as long as you, but I do hate windows lol) and how easily you can interface with the os on a lower level. I also do computer science, and I love unix for programming as well. The OS is very quick and snappy, unlike windows (no offense i use win7 almost everyday for certain engineering applications).
If you are having problems, perhaps you can try reinstalling the operating system..... i know it isn't ideal, but I know people have had success doing that.. it is a drastic move I will admit, but it can help. You can of course just reinstall the os (leaving all your apps and docs in place) however, this may not be as effective as a clean installation.
I don't think I've seen anyone recommend a "permissions repair" (sorry if I missed it) but open disk utility disk, in the left hand panel, click on your hardrive (probably labeled macHD or MacintoshHD, i forget what they call them now) and below the middle window there is a button that says "repair disk permissions" it will take a few minutes but it may fix some problems. Try that before you reinstall the os
another thing that may help is opening up a terminal window and typing in "sudo periodic daily weekly monthly" and press enter, it will tell you it can be dangerous lol, sudo is basically taking control of the operating system... its like windows "administrator" but with superpowers you can't imagine. It will ask you to type in your password. Note: when you type nothing will appear on the screen, security reasons of course, then hit enter. so what does that do? thats fair you shouldn't do things without reason but unix OS's need to run maintenance scripts, macs do this around 3 am....but since most are off at this time, they won't execute these scripts. heres a description of what they do
http://www.thexlab.com/faqs/maintscripts.html#Anchor-The-11481
they basically just clean up logs and databases, cleaning them up, it may slightly speed up performance, hope that helped
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Interested to hear how you find things with 8GB.
As an act of solidarity as another IT tech, I personally never had a need for more RAM than 4GB when I was using Win7...nor did I need more under Snow Leopard (even with Windows running alongside as a VM). BUT after Lion came along my Mac operated in BeachBallsville until I upgraded to 8GB.
i also agree with windowstomac, lion uses a TON of memory. that's all there is to it. I still use SL (haven't upgraded and have very little interest) so more ram may help. also switching off the resume apps and such will definitely slow everything down, disabling those options will undoubtedly boost performance