Somehow my problem is related to the number of Addons activated. Probably the 
email is processed by every Addon before displayed and for some reasons this 
process is very slow. 
The Addon produced the most trouble is Enigmail. When almost all Addons are 
deactivated an email of 1 MB opens within 2 seconds (which is still not fast 
IMHO). With Enigmal activated it takes up to 30 seconds. With other Addons it 
goes up to 5 seconds or more.

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https://bugs.launchpad.net/bugs/1045760

Title:
  thunderbird is getting slow when viewing large text emails

Status in “thunderbird” package in Ubuntu:
  New

Bug description:
  When you open large text emails (~ 500k) thunderbird is getting very
  slow.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: thunderbird 15.0+build1-0ubuntu0.12.04.1
  ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
  Uname: Linux 3.2.0-29-generic x86_64
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: I82801AAICH [Intel 82801AA-ICH], device 0: Intel ICH [Intel 
82801AA-ICH]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  ApportVersion: 2.0.1-0ubuntu12
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  th         1573 F.... pulseaudio
  BrokenPermissions:
   extensions/[email protected] (0400)
   extensions/[email protected] (0400)
  BuildID: 20120827103657
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  Card0.Amixer.info:
   Card hw:0 'I82801AAICH'/'Intel 82801AA-ICH with STAC9700,83,84 at irq 21'
     Mixer name : 'SigmaTel STAC9700,83,84'
     Components : 'AC97a:83847600'
     Controls      : 34
     Simple ctrls  : 24
  Channel: Unavailable
  Date: Tue Sep  4 13:03:24 2012
  ForcedLayersAccel: False
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
   
   tun0      no wireless extensions.
  MostRecentCrashID: bp-eae5a601-4fcc-4bef-8747-88f322120903
  ProcEnviron:
   TERM=xterm
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/usr/bin/zsh
  Profiles: Profile0 (Default) - LastVersion=15.0/20120827103657 (In use)
  RelatedPackageVersions:
   rhythmbox-mozilla 2.96-0ubuntu4.1
   gnome-shell       3.4.1-0ubuntu2
   totem-mozilla     3.0.1-0ubuntu21
  RfKill:
   
  RunningIncompatibleAddons: False
  SourcePackage: thunderbird
  SubmittedCrashIDs: bp-eae5a601-4fcc-4bef-8747-88f322120903
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.modalias: 
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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