Trying to speed up MacBook Air

Hi -
I'm trying to speed up my son's Air. I have found an error that helped. But, it is still really slow. Here is the info on the book :
Model Name: MacBook Air
Model Identifier: MacBookAir1,1
Processor Name: Intel Core 2 Duo
Processor Speed: 1.6 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 800 MHz
Boot ROM Version: MBA11.00BB.B03
SMC Version (system): 1.23f20
Serial Number (system): W8******Y51
Hardware UUID: 5F0B333F-3F34-5F18-A37A-426A78C08D80
Sudden Motion Sensor:
State: Enabled
I was wondering what (if any) of the launch agents I can delete , as he has downloaded so many things over the last few years it is hard to find out what is being used/or nessasary. If anyone can spot out things that are not needed or RAM hogs - thanks for the time
com.apple.AddressBook.abd.plist
com.apple.AirPortBaseStationAgent.plist
com.apple.alf.useragent.plist
com.apple.AOSNotificationOSX.plist
com.apple.AppleGraphicsWarning.plist
com.apple.BezelUI.plist
com.apple.coredata.externalrecordswriter.plist
com.apple.CoreLocationAgent.plist
com.apple.coremedia.videodecoder.plist
com.apple.coreservices.uiagent.plist
com.apple.cvmsCompAgent_i386.plist
com.apple.cvmsCompAgent_ppc.plist
com.apple.cvmsCompAgent_x86_64.plist
com.apple.datadetectors.compiler.plist
com.apple.DictionaryPanelHelper.plist
com.apple.Dock.plist
com.apple.familycontrols.useragent.plist
com.apple.FileSyncAgent.plist
com.apple.Finder.plist
com.apple.fontd.useragent.plist
com.apple.FontRegistryUIAgent.plist
com.apple.FontValidator.plist
com.apple.FontValidatorConduit.plist
com.apple.FontWorker.plist
com.apple.gssd-agent.plist
com.apple.helpd.plist
com.apple.imklaunchagent.plist
com.apple.installd.user.plist
com.apple.isst.plist
com.apple.Kerberos.renew.plist
com.apple.KerberosHelper.LKDCHelper.plist
com.apple.metadata.mdwrite.plist
com.apple.midiserver.plist
com.apple.netauth.useragent.plist
com.apple.NetworkDiagnostics.plist
com.apple.parentalcontrols.check.plist
com.apple.pboard.plist
com.apple.pbs.plist
com.apple.pcastuploader.plist
com.apple.PCIESlotCheck.plist
com.apple.pictd.plist
com.apple.PreferenceSyncAgent.plist
com.apple.PubSub.Agent.plist
com.apple.quicklook.plist
com.apple.RemoteDesktop.plist
com.apple.RemoteUI.plist
com.apple.ReportCrash.plist
com.apple.ReportCrash.Self.plist
com.apple.ReportPanic.plist
com.apple.ScreenReaderUIServer.plist
com.apple.ScreenSharing.plist
com.apple.scrod.plist
com.apple.ServerScanner.plist
com.apple.SubmitDiagInfo.plist
com.apple.syncservices.SyncServer.plist
com.apple.syncservices.uihandler.plist
com.apple.SystemUIServer.plist
com.apple.tiswitcher.plist
com.apple.TrustEvaluationAgent.plist
com.apple.unmountassistant.useragent.plist
com.apple.UserEventAgent-Aqua.plist
com.apple.UserEventAgent-LoginWindow.plist
com.apple.VoiceOver.plist
com.apple.warmd_agent.plist
com.apple.WebKit.PluginAgent.plist
org.openbsd.ssh-agent.plist
org.x.startx.plist
<S/N Edited by Host>

hahaha - this is never ending.
I did a "repair disk permissions" and got these errors (looks like something in Kerberos, whatever that is)
Open error 18446744073709551594: "Unknown error: -22" on System/Library/CoreServices/CCacheServer.app/Contents/MacOS/CCacheServer
Open error 18446744073709551594: "Unknown error: -22" on System/Library/CoreServices/KerberosAgent.app/Contents/Resources/German.lproj/A uthentication.nib/keyedobjects.nib
Open error 18446744073709551594: "Unknown error: -22" on System/Library/CoreServices/KerberosAgent.app/Contents/Resources/Japanese.lproj /SelectIdentity.nib/keyedobjects.nib
Open error 18446744073709551594: "Unknown error: -22" on System/Library/CoreServices/KerberosAgent.app/Contents/Resources/fi.lproj/Authe ntication.nib/keyedobjects.nib
Open error 18446744073709551594: "Unknown error: -22" on System/Library/CoreServices/KerberosAgent.app/Contents/Resources/pl.lproj/Authe ntication.nib/keyedobjects.nib
Open error 18446744073709551594: "Unknown error: -22" on System/Library/CoreServices/KerberosAgent.app/Contents/Resources/pt_PT.lproj/Au thentication.nib/keyedobjects.nib
Open error 18446744073709551594: "Unknown error: -22" on System/Library/CoreServices/KerberosAgent.app/Contents/Resources/pt_PT.lproj/Se lectIdentity.nib/keyedobjects.nib
Open error 18446744073709551594: "Unknown error: -22" on System/Library/CoreServices/KerberosAgent.app/Contents/Resources/ru.lproj/Authe ntication.nib/keyedobjects.nib
Open error 18446744073709551594: "Unknown error: -22" on System/Library/CoreServices/KerberosAgent.app/Contents/Resources/ru.lproj/Selec tIdentity.nib/keyedobjects.nib
Open error 18446744073709551594: "Unknown error: -22" on System/Library/CoreServices/KerberosAgent.app/Contents/Resources/zh_TW.lproj/Se lectIdentity.nib/keyedobjects.nib
Open error 18446744073709551594: "Unknown error: -22" on System/Library/KerberosPlugins/KerberosFrameworkPlugins/LKDCLocate.bundle/Conte nts/MacOS/LKDCLocate
Open error 18446744073709551594: "Unknown error: -22" on System/Library/PreferencePanes/MobileMe.prefPane/Contents/MacOS/MobileMe
Open error 18446744073709551594: "Unknown error: -22" on System/Library/PrivateFrameworks/GSSRPC.framework/Versions/A/GSSRPC
Open error 18446744073709551594: "Unknown error: -22" on System/Library/PrivateFrameworks/KerberosHelper.framework/Versions/A/KerberosHe lper
Open error 18446744073709551594: "Unknown error: -22" on System/Library/PrivateFrameworks/KerberosHelper.framework/Versions/A/Resources/ kcc-debug
Open error 18446744073709551594: "Unknown error: -22" on System/Library/PrivateFrameworks/KerberosHelper.framework/Versions/A/Resources/ lkdc_acl
Open error 18446744073709551594: "Unknown error: -22" on usr/sbin/kadmin
Open error 18446744073709551594: "Unknown error: -22" on usr/sbin/kadmin.local
Open error 18446744073709551594: "Unknown error: -22" on usr/sbin/kadmind
anybody no if / how to fix this
ps - I did run the repair twice

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