Apps you don't need

Hi, I have several basic questions about apps on a MacBook Pro running OSX 10.7.4.
First, do the apps in the app folder delay my MacBook Pros' startup time?
Second, do they slow my browser attempting to update at seemingly random times without my expressed consent?
Third, since I loaded many free apps onto my drive when I first started with this laptop. I guess I thought they were "too good to pass up" at the time. I am concerned that they are merely taking up space.
Here is my list of seldom or rarely used apps: Alfred; Automator; Diskspeed test, Chipmunk; Cocktail; Cyberduck; Evernote; FreeMemory; Hexedit; iClapperPro; iCleanMemory; iStumbler; KISmac; Microsoft Silverlight; Mover Connect; Netspot; Network Strength; Speakline; Spotify; Switch; The Unarchiver; Transmission; TuneAid; VLC; Vuse; WifiAnalyzser; Virtual DJ Home.
My final question is: are any of these app worthless, dangerous, or detrimental to my startup time or online speed?
Advance thanks for any advice and information.

I know many, but not all of the apps. The question about performance goes to whether any of these automatically load at startup and then run in the background. That would have an effect on RAM and could slow you down. Mostly they're just taking up space on your hard drive, so I wouldn't hang on to things I really don't use.
Of the list there are several I use and like: Automator;  Cyberduck; Evernote; iClapperPro; iStumbler;   Netspot; Spotify; Switch; The Unarchiver;  VLC; Vuse; WifiAnalyzser.
You have a lot of network analyzers so I'm assuming that's something you find useful - looks like a number of them duplicate each other. Open Activity Monitor in the utilities folder right after a startup and see which of these loads something in right off. As for Silverlight - there are some other things that depend on it being there - if you eliminate it and are never asked to have it available you'll certainly know you don't need it.

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