This is a common problem to all browsers so far as I know. This  because of the 
way that the browser uses the cache the more it has to wade thru the slower it 
is.  Setting the auto dump to lower MB might help.
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** Changed in: firefox (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1100398

Title:
  Firefox browsing very slow when cache full

Status in “firefox” package in Ubuntu:
  Invalid

Bug description:
  I was browsing Amazon website using Firefox. It took 1 minute + to do
  a search in the site. I cleared the cache and it was fine. I have not
  changed the original cache setting, which is automatic. I noticed that
  the 'currently using' was 350MB & that 'limit cache to' was grayed out
  as 350MB. I cleared the cache and it was fine.

  This was using Ubuntu 12.04.1 using Firefox
  18.0+build1-0ubuntu0.12.04.3.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: firefox 18.0+build1-0ubuntu0.12.04.3
  ProcVersionSignature: Ubuntu 3.2.0-35.55-generic 3.2.34
  Uname: Linux 3.2.0-35-generic x86_64
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: HDA Generic [HDA Generic]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  john       9626 F.... pulseaudio
   /dev/snd/controlC0:  john       9626 F.... pulseaudio
  BuildID: 20130107224849
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf7d00000 irq 42'
     Mixer name : 'Realtek ID 887'
     Components : 'HDA:10ec0887,1458a002,00100302'
     Controls      : 5
     Simple ctrls  : 4
  Card1.Amixer.info:
   Card hw:1 'U0x46d0x9a4'/'USB Device 0x46d:0x9a4 at usb-0000:00:1d.0-1.5.7.4, 
high speed'
     Mixer name : 'USB Mixer'
     Components : 'USB046d:09a4'
     Controls      : 2
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'Mic',0
     Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
     Capture channels: Mono
     Limits: Capture 0 - 14
     Mono: Capture 14 [100%] [34.25dB] [on]
  Channel: Unavailable
  Date: Wed Jan 16 17:40:16 2013
  ForcedLayersAccel: False
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 10.04.4 LTS "Lucid Lynx" - Release amd64 
(20120214.2)
  IpRoute:
   default via 192.168.1.1 dev eth0  proto static 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.3  metric 1
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  MarkForUpload: True
  MostRecentCrashID: bp-07cee06a-46cb-442c-bf08-576722120424
  PrefSources:
   prefs.js
   
[Profile]/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/defaults/preferences/prefs-dwhelper.js
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=18.0/20130107224849 (In use)
  RfKill:
   0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  SubmittedCrashIDs: bp-07cee06a-46cb-442c-bf08-576722120424
  UpgradeStatus: Upgraded to precise on 2012-12-14 (33 days ago)
  dmi.bios.date: 12/19/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: FA
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H61M-S2PV
  dmi.board.vendor: INTEL Corporation
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Tecohnology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrFA:bd12/19/2011:svnGigabyteTecohnologyCo.,Ltd.:pnH61M-S2PV:pvrTobefilledbyO.E.M.:rvnINTELCorporation:rnH61M-S2PV:rvrTobefilledbyO.E.M.:cvnGigabyteTecohnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: H61M-S2PV
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Tecohnology Co., Ltd.

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