Hello Wolf,
Thank you for submitting this bug and reporting a problem with slow performance 
in Thunderbird.  You made this bug report in 2016 and there have been several 
versions of Ubuntu and Thunderbird since then. 

Could you confirm that this is no longer a problem and that we can close the 
ticket? 
If it is still a problem, are you still interested in finding a solution to 
this bug? 
If you are, could you run the following (only once):
apport-collect BUGNUMBER
and upload the updated logs and and any other logs that are relevant for this 
particular issue. 

Thank you again for helping make Ubuntu and Thunderbird better. 
G

** Changed in: thunderbird (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1646455

Title:
  Unacceptably slow performance in Thunderbird

Status in thunderbird package in Ubuntu:
  Incomplete

Bug description:
  Starting with 16.10 Thunderbirds startup time became agonizingly slow
  From less than 3 seconds (to the blank window) and less than 7 seconds (to 
accepting input) 
  to 17 seconds (blank window) and 28 seconds (to accepting input)
  [same machine, same plugins]

  Now, with the update to 45.5.1 sending an email increase the time from
  pressing send to the disappearance of the window from 1 second to more
  than 9 seconds (on average).

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: thunderbird 1:45.5.1+build1-0ubuntu0.16.10.1
  ProcVersionSignature: Ubuntu 4.8.0-28.30-generic 4.8.6
  Uname: Linux 4.8.0-28-generic x86_64
  NonfreeKernelModules: nvidia_uvm wl nvidia_drm nvidia_modeset nvidia
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  wolf       2669 F.... pulseaudio
   /dev/snd/controlC0:  wolf       2669 F.... pulseaudio
  BuildID: 20161130102337
  Channel: Unavailable
  CurrentDesktop: Unity
  Date: Thu Dec  1 11:57:31 2016
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions:
   Enigmail - {847b3a00-7ab1-11d4-8f02-006008948af5}
   English (GB) Language Pack - [email protected]
   Deutsch (DE) Language Pack - [email protected]
   Thunderbird (default) - {972ce4c6-7e08-4474-a285-3208198ce6fd}
  InstallationDate: Installed on 2016-10-22 (40 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
  IpRoute:
   default via 10.1.0.254 dev wlp4s0  proto static  metric 600 
   10.0.0.0/8 dev wlp4s0  proto kernel  scope link  src 10.1.0.168  metric 600 
   169.254.0.0/16 dev wlp4s0  scope link  metric 1000 
   172.16.220.0/24 dev vmnet1  proto kernel  scope link  src 172.16.220.1 
   192.168.68.0/24 dev vmnet8  proto kernel  scope link  src 192.168.68.1
  MostRecentCrashID: bp-09b01898-5a57-4940-bf7b-9ce882161021
  PrefSources:
   prefs.js
   
[Profile]/extensions/{25cf5f06-b211-4df3-9d5a-c0ab253a5561}.xpi:defaults/preferences.js
   
[Profile]/extensions/{847b3a00-7ab1-11d4-8f02-006008948af5}/defaults/preferences/enigmail.js
   
/usr/lib/thunderbird/extensions/{a62ef8ec-5fdc-40c2-873c-223b8a6925cc}/defaults/preferences/preferences.js
   
/usr/lib/thunderbird/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}/defaults/preferences/lightning.js
  Profiles: Profile0 (Default) - LastVersion=45.5.1/20161130102337 (In use)
  RunningIncompatibleAddons: True
  SourcePackage: thunderbird
  SubmittedCrashIDs:
   bp-09b01898-5a57-4940-bf7b-9ce882161021
   bp-57849896-c2e9-45b1-9cbf-0bf392160823
   bp-47c994ab-4894-4453-a743-08c592160525
   bp-407af357-4517-4945-a8da-f0d482151002
   bp-b1c86d9c-9939-42a2-af8d-f9e6c2150903
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/21/2012
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP101.88Z.00EE.B03.1212211437
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-C3EC7CD22292981F
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro10,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-C3EC7CD22292981F
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMBP101.88Z.00EE.B03.1212211437:bd12/21/2012:svnAppleInc.:pnMacBookPro10,1:pvr1.0:rvnAppleInc.:rnMac-C3EC7CD22292981F:rvrMacBookPro10,1:cvnAppleInc.:ct10:cvrMac-C3EC7CD22292981F:
  dmi.product.name: MacBookPro10,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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