I've noticed the same thing. I went back to 3.2
Which version of Eclipse are you using? You can download the "eclipse classic" which is not too bad. If you download the distributions that include tools for Java developers, etc., it will make you pay... :)
I saw this thread - stackoverflow.com/questions/1490803/… They recommend shutting off the spell checker. I tried it and saved over 100 MB.
Thanks, tried "net use", got "There are no entries in the list." I think it may be something more systematic; FireFox does the same once in a while.
"Net Use" only shows connections. I recommend disabling superfetch all the time. It's job is to consume all of your available memory by caching things you might use in the future. My typical use performs better when I have free memory available when needed.