Package: thunderbird
Version: 1:52.2.1-4~deb9u1
Severity: important

Dear Maintainer,

Since the upgrade to the latest stable version, in combination with
enigmail and lightning; thunderbird has become so slow that it is
basically unusable.
Scrolling required 2s to move anything. Mails open very slowly, etc.

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
   Upgrade of thunderbird from 45.8.0 to 52.2.1-4~deb9u1, as well as
   enigmail and lightning to the latest stable version.

   * What exactly did you do (or not do) that was effective (or
   I tried to find the cause for this issue by uninstalling some older
   extensions and disabling all others.
   After several restarts with each time enabling another extension I
   discovered that lightning seems to be the issue here.
   Disabling it, reverses any problems.

   After having discovered this I tried to clean out any cache there was
   in my profile, but to no effect.
   Only disabling it fixed the problem.

   * What was the outcome of this action?
   Things worked again.

*** End of the template - remove these template lines ***

-- System Information:
Debian Release: 9.1
  APT prefers stable
APT policy: (700, 'stable'), (500, 'stable'), (250, 'testing'), (150, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-3-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages thunderbird depends on:
ii  debianutils     
ii  fontconfig                2.11.0-6.7+b1
ii  libatk1.0-0               2.22.0-1
ii  libc6                     2.24-11+deb9u1
ii  libcairo-gobject2         1.14.8-1
ii  libcairo2                 1.14.8-1
ii  libdbus-1-3               1.10.18-1
ii  libdbus-glib-1-2          0.108-2
ii  libevent-2.0-5            2.0.21-stable-3
ii  libffi6                   3.2.1-6
ii  libfontconfig1            2.12.3-0.2
ii  libfreetype6              2.6.3-3.2
ii  libgcc1                   1:6.3.0-18
ii  libgdk-pixbuf2.0-0        2.36.5-2
ii  libglib2.0-0              2.50.3-2
ii  libgtk-3-0                3.22.11-1
ii  libhunspell-1.4-0         1.4.1-2+b2
ii  libpango-1.0-0            1.40.5-1
ii  libpangocairo-1.0-0       1.40.5-1
ii  libpangoft2-1.0-0         1.40.5-1
ii  libpixman-1-0             0.34.0-1
ii  libstartup-notification0  0.12-4+b2
ii  libstdc++6                6.3.0-18
ii  libvpx4                   1.6.1-3
ii  libx11-6                  2:1.6.4-3
ii  libx11-xcb1               2:1.6.4-3
ii  libxcb-shm0               1.12-1
ii  libxcb1                   1.12-1
ii  libxcomposite1            1:0.4.4-2
ii  libxdamage1               1:1.1.4-2+b3
ii  libxext6                  2:1.3.3-1+b2
ii  libxfixes3                1:5.0.3-1
ii  libxrender1               1:0.9.10-1
ii  libxt6                    1:1.1.5-1
ii  psmisc                    22.21-2.1+b2
ii  x11-utils                 7.7+3+b1
ii  zlib1g                    1:1.2.8.dfsg-5

Versions of packages thunderbird recommends:
ii  hunspell-de-de [hunspell-dictionary]         20161207-1
ii  hunspell-en-gb [hunspell-dictionary]         1:5.2.5-1
ii  hunspell-en-us [hunspell-dictionary]         20070829-7
ii  hunspell-fr-classical [hunspell-dictionary]  1:5.7-1
ii  lightning                                    1:52.2.1-4~deb9u1

Versions of packages thunderbird suggests:
ii  apparmor          2.11.0-3
ii  fonts-lyx         2.2.2-1
ii  libgssapi-krb5-2  1.15-1

-- no debconf information

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