Q: Mavericks too slow

mavericks make make my macbook air 2011 two to third time slower!

this below is  EtreCheck  detalis

Hardware Information:

          MacBook Air (11-inch, Mid 2011)

          MacBook Air - model: MacBookAir4,1

          1 1.6 GHz Intel Core i5 CPU: 2 cores

          4 GB RAM

Video Information:

          Intel HD Graphics 3000 - VRAM: 384 MB

Audio Plug-ins:

          BluetoothAudioPlugIn: Version: 1.0

          AirPlay: Version: 1.9

          AppleAVBAudio: Version: 2.0.0

          iSightAudio: Version: 7.7.3

Startup Items:

          Fantom - Path: /Library/StartupItems/Fantom

          Jaksta - Path: /Library/StartupItems/Jaksta

          VirtualBox - Path: /Library/StartupItems/VirtualBox

System Software:

          OS X 10.9 (13A603) - Uptime: 0 days 0:31:28

Disk Information:

          APPLE SSD SM128C disk0 : (121.33 GB)

                    EFI (disk0s1) <not mounted>: 209.7 MB

                    Mac Drive (disk0s2) /: 120.47 GB (25.57 GB free)

                    Recovery HD (disk0s3) <not mounted>: 650 MB

USB Information:

          Apple Inc. Apple Internal Keyboard / Trackpad

          Apple Inc. BRCM20702 Hub

                    Apple Inc. Bluetooth USB Host Controller

          Apple Inc. FaceTime Camera (Built-in)

FireWire Information:

Thunderbolt Information:

          Apple Inc. thunderbolt_bus

Kernel Extensions:

          org.virtualbox.kext.VBoxDrv          (4.2.8)

          org.virtualbox.kext.VBoxUSB          (4.2.8)

          com.bresink.driver.BRESINKx86Monitoring          (9.0)

Problem System Launch Daemons:

Problem System Launch Agents:

Launch Daemons:

          [loaded] com.adobe.fpsaud.plist

          [loaded] com.parallels.desktop.launchdaemon.plist

Launch Agents:

          [failed] com.parallels.desktop.launch.plist

          [loaded] com.parallels.DesktopControlAgent.plist

          [loaded] com.parallels.vm.prl_pcproxy.plist

          [loaded] net.culater.SIMBL.Agent.plist

User Launch Agents:

          [loaded] com.google.keystone.agent.plist

          [loaded] net.infinite-labs.SIMBLEnablerForSandboxedApps.plist

          [not loaded] org.virtualbox.vboxwebsrv.plist

User Login Items:

          CPULed

          iTunesHelper

          Moom

          CrossOver CD Helper

          Temperature Monitor

          Music Manager

          Google Drive

          Android File Transfer Agent

          TomTomHOMERunner

3rd Party Preference Panes:

          Flash Player

          Java

          Microsoft Keyboard

          Microsoft Mouse

          MusicManager

Internet Plug-ins:

          Default Browser.plugin

          Flash Player.plugin

          FlashPlayer-10.6.plugin

          GarminGpsControl.plugin

          iPhotoPhotocast.plugin

          JavaAppletPlugin.plugin

          QuickTime Plugin.plugin

          Silverlight.plugin

User Internet Plug-ins:

          RealPlayer Plugin.plugin

Bad Fonts:

          None

Time Machine:

          Skip System Files: NO

          Mobile backups: OFF

          Auto backup: NO

          Volumes being backed up:

                    Mac Drive: Requires: 94.91 GB

          Destinations:

                    time machine [Local] (Last used)

                    Total size: 250.19 GB

                    Total number of backups: 0

                    Space available for backups: Insufficient!

Top Processes by CPU:

              9%          WindowServer

              7%          SIMBL Enabler for Sandboxed Apps

              3%          Safari

              2%          EtreCheck

              1%          hidd

              1%          prl_disp_service

              1%          ps

              1%          Moom

              0%          launchservicesd

              0%          CPULed

Top Processes by Memory:

          188 MB             Safari

          131 MB             mds_stores

          79 MB              com.apple.WebKit.WebContent

          78 MB              Dictionary

          70 MB              WindowServer

          66 MB              SystemUIServer

          57 MB              Dock

          57 MB              Google Drive

          53 MB              Finder

          53 MB              CalendarAgent

Virtual Memory Statistics

          468 MB             Free RAM

          1.26 GB            Active RAM

          898 MB             Inactive RAM

          1.04 GB            Wired RAM

          293 MB             Page-ins

          1 MB               Page-outs