New OS system safari now running slow and crashing repeatedly

Can someone please tell me why my Macbook Air running Safari with just 3 windows open in Safari is now running incredibly slow, barely downloading either java or flash text and invariably causing it to crash with the spinning rainbow appearing almost every 2 minutes.
I am very inept when it comes to computers but cannot believe the new system would cause such problems.
Solutions all helpful.
Thanks,
Sam

Similar problem https://discussions.apple.com/message/23591269#23591269
Reset PRAM.  http://support.apple.com/kb/PH4405

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      disk2s3 (disk2s3) <not mounted> : 11 MB
      disk2s4 (disk2s4) <not mounted> : 12 MB
      disk2s5 (disk2s5) <not mounted> : 8 MB
      disk2s6 (disk2s6) <not mounted> : 11 MB
      disk2s7 (disk2s7) <not mounted> : 13 MB
      disk2s8 (disk2s8) <not mounted> : 14 MB
      disk2s9 (disk2s9) <not mounted> : 14 MB
      disk2s10 (disk2s10) <not mounted> : 15 MB
      disk2s11 (disk2s11) <not mounted> : 8 MB
      disk2s12 (disk2s12) <not mounted> : 9 MB
      disk2s13 (disk2s13) <not mounted> : 27 MB
      disk2s14 (disk2s14) <not mounted> : 16 MB
      disk2s15 (disk2s15) <not mounted> : 23 MB
      disk2s16 (disk2s16) <not mounted> : 12 MB
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      disk2s18 (disk2s18) <not mounted> : 24 MB
      disk2s19 (disk2s19) <not mounted> : 14 MB
      disk2s20 (disk2s20) <not mounted> : 18 MB
      disk2s21 (disk2s21) <not mounted> : 10 MB
      disk2s22 (disk2s22) <not mounted> : 36 MB
      disk2s23 (disk2s23) <not mounted> : 17 MB
      disk2s24 (disk2s24) <not mounted> : 20 MB
      disk2s25 (disk2s25) <not mounted> : 18 MB
      disk2s26 (disk2s26) <not mounted> : 42 MB
      disk2s27 (disk2s27) <not mounted> : 33 MB
      disk2s28 (disk2s28) <not mounted> : 29 MB
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      [failed] com.apple.printtool.agent.plist
      [failed] com.apple.recentsd.plist
      [failed] com.apple.scopedbookmarkagent.xpc.plist
      [failed] com.apple.secd.plist
      [failed] com.apple.security.cloudkeychainproxy.plist
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      [failed] com.apple.ifdreader.plist
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      [failed] com.apple.periodic-daily.plist
      [failed] com.apple.softwareupdate_download_service.plist
      [failed] com.apple.systemstats.analysis.plist
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      [invalid?] com.sophos.uiserver.plist Support
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      [loaded] com.adobe.fpsaud.plist Support
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      [loaded] com.adobe.ARM.[...].plist Support
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      JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
      FlashPlayer-10.6: Version: 15.0.0.189 - SDK 10.6 Support
      Default Browser: Version: 600 - SDK 10.10
      AdobePDFViewerNPAPI: Version: 11.0.09 - SDK 10.6 Support
      AdobePDFViewer: Version: 11.0.09 - SDK 10.6 Support
      Flash Player: Version: 15.0.0.189 - SDK 10.6 Support
      QuickTime Plugin: Version: 7.7.3
      Silverlight: Version: 5.1.10411.0 - SDK 10.6 Support
      iPhotoPhotocast: Version: 7.0 - SDK 10.8
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      Move_Media_Player: Version: npmnqmp 071505000006 Support
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      Flash Player  Support
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      Skip System Files: NO
      Mobile backups: ON
      Auto backup: YES
      Destinations:
      GoFlex Home Backup [Network]
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      Total number of backups: 70
      Oldest backup: 2013-07-21 16:39:58 +0000
      Last backup: 2014-10-17 01:49:13 +0000
      Size of backup disk: Excellent
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          5% WindowServer
          1% diskimages-helper
          0% backupd
          0% AppleSpell
          0% fontd
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      116 MB backupd
      77 MB Dock
      52 MB Finder
      47 MB com.apple.WebKit.Networking
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      48 MB Free RAM
      1.08 GB Active RAM
      1.04 GB Inactive RAM
      1.19 GB Wired RAM
      33.41 GB Page-ins
      1.26 GB Page-outs

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