GPGMail: GPGMail makes Mac slow - uses a lot of CPU

Metin's Avatar


15 Aug, 2018 12:17 PM

Since the last update, I experience the problem that when displaying a PGP encrypted email, GPGMail uses so much CPU that my Mac doesn’t respond well any more.

This seems to be not only shortly while decrypting (which I would accept), but as long as the message is displayed.

I would expect high CPU usage only shortly while decrypting, not continuously while displaying the decrypted email.

macOS                   10.12.6     16G1510
GPG Suite               2018.3      2223    (8d0c266)
GPGMail                 2.7.3       1268    (b7a4d043)
GPG Keychain            1.4.4       1460    (9010342)
GPGServices             1.11.4      1013    (0b04f6c)
MacGPG                  2.2.8       916     (0ed4a99)
GPG Suite Preferences   2.1.2       997     (1a09bc7)
Libmacgpg               0.8.5       863     (0707962)
pinentry           9       (db18340)
  1. Support Staff 1 Posted by Steve on 17 Aug, 2018 02:30 PM

    Steve's Avatar

    Hi Metin,

    welcome to the GPGTools support platform. Sorry you are having problems using GPG Suite.

    Is this happening when selecting any encrypted message or one specific message? If the latter, can you isolate that message in a separate folder and see if the problem persists if you only select the inbox in

    While the issue is happeing, could you please create the following debug information:


    • open Activity Monitor
    • sort after 'Process Name' (first column) and select Mail
    • click the cogwheel icon and select 'Spindump'
    • 'Save...' the Spindump output to your desktop
    • attach the resulting file to your existing discussion

    Process Sample

    • open Activity Monitor
    • sort after 'Process Name' (first column) and select Mail
    • click the cogwheel icon and select 'Sample Process'
    • 'Save...' the Spindump output to your desktop
    • attach the resulting file to your existing discussion


  2. 2 Posted by Metin on 27 Sep, 2018 09:57 AM

    Metin's Avatar

    Sorry for not getting back earlier. I have been trying to find out when exactly this happens, but I wasn't able to find a reproducable rule.

    However, I suspect that saving email drafts while typing is causing a high cpu usage, especially when replying to a long mail thread (which is all quoted in the reply mail).

    I'm still trying to hunt this down, and as soon as I have some reliable ideas, I'll get back with the requested data.


  3. 3 Posted by Metin on 05 Oct, 2018 12:53 PM

    Metin's Avatar

    Hi guys,

    Today I experienced a severe problem when trying to reply to a gpg encrypted email. The computer was getting so slow that I when typing it took seconds for the characters to appear. Finally, I got a message that my system is out of memory. I checked through activity monitor, but the memory report was green (like 10 out of 16 GB used). However, in the task list, Mail was reported to use over 26 GB of memory!

    I was hardly able to use the computer, so I couldn't check in your message what you requested, but I've created 2 system reports that might help to track down the problem.

    After I restarted my Mac, Mail worked flawlessly with now only between 200MB and 400MB of memory usage. My Mac had been running for 24 days before that. I suspect a memory leakage somewhere that with time leads to the problems I experienced.

    I'd appreciate your help. Please let me know if I can provide more info.


  4. 4 Posted by Metin on 06 Oct, 2018 10:03 AM

    Metin's Avatar

    Hi Steve,

    After the restart of my computer, I've experienced the original problem again. I'm not sure at all if it is connected to the other problem. Symptoms are different:

    • Mail memory usage is at sane 700 MB currently
    • I open a (quite long) pgp encyrpted email
    • Scrolling is laggy, but cpu usage seems ok yet - I guess that's due to decrypting the email on the fly?
    • I hit the reply button
    • Now the Mac starts to lag extremely. When I type my reply, it takes seconds until the letters appear. It makes me crazy because as I can't see what I'm typing, a lot of typos occur, and when I try to move the cursor to correct the typo, due to the lags it's difficult to position is correctly, creating even more typos.
    • cpu goes up, and the fan starts to become very loud. Even when I stop typing, the symptoms don't go away. The only thing I can do to calm down my Mac is to close the reply message.

    I attach two more of the requested files and hope this helps to identify the problem.


  5. Support Staff 5 Posted by Steve on 29 Oct, 2018 04:51 PM

    Steve's Avatar

    HI Metin,

    please excuse the late reply, we are deeply sorry for not responding earlier. The amount of feedback we received in regards to the GPG Suite 2018.4 release was overwhelming. We are doing our best to catch up as fast as we can.

    Does this problem persist with GPG Suite 2018.5?


  6. 6 Posted by Metin on 29 Oct, 2018 05:18 PM

    Metin's Avatar

    Hi Steve,

    To be honest, I haven't installed the new version yet. I've been very busy, too. I will get back to you after I've done that and let you know.


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