Help with memory management

Hi apple community - I'm at a loss.... Can someone please help me with my memory management? My computer has become so slow lately. I've read a bunch of forums and can't seem to find anything that helps. I can't find a pattern to the slowness other than when I use big files in Photoshop it slows down quite a bit, but I assume that's normal when you're editing photos that are around 1GB... My computer doesn't really seem to be releasing inactive memory at all. Once it goes inactive, I can close all the programs I want but it never becomes free. I tried applications like "Free memory" and they worked but it's not really fixing the problem and when I do re-open stuff it takes FOREVER so I didn't really like using those.  I attached a screen shot of my activity monitor... Any help would be much appreciated... thanks!

Simple fact is it looks like you have every program ever installed on your system open all at the same time.
Post how Many Processes are running. I bety it is well over 100.
Sure 8GBs is plenty of RAM IF you actually shut down, QUIT, Programs you are done using them.
Just from the SS you posted you have Spotify, Numbers, Pages, Skype and Safari all open and running, let alone what isn't shown in that SS. And now you open Photoshop and load a Large Image and you expect the system to just fly. Not going to happen. The whole Apple Mac thing of not shutting down programs when you close the last Windows that is open on the desktop has always been IMHO Very Stupid. In this Respect Windows has OS X beat Hands Down (alone with other feature that are just done better in Windows). You Click the X and the window and program close which frees up the RAM and all resources that program was using.
So Shut some of that Stuff Down. System will get faster.

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