https://bugs.kde.org/show_bug.cgi?id=422336

--- Comment #14 from Marc Mezzarobba <marc+b...@mezzarobba.net> ---
Another, possibly more informative, perf report on the akonadi_maildir_resource
process. (I don't understand why perf no longer manages to resolve the symbols
are those from libQt5Core; I tried purging the buildid cache, to no avail.)

    99.62%    99.11%  SessionThread    libQt5Core.so.5.12.5               
            |          
            |--92.11%--QApplication::notify
            |          QApplicationPrivate::notify_helper
            |          QReadNotifier::event
            |          QAbstractSocketPrivate::canReadNotification
            |          QAbstractSocketPrivate::emitReadyRead
            |          0x7effbccc1385
            |          0x7effbccc14e3
            |          Akonadi::Connection::handleIncomingData
            |          |          
            |           --92.05%--0x7effbccc3bd2
            |                     |          
            |                      --92.05%--0x7effbccc3240
            |          
            |--2.16%--0x7effbcc956d6
            |          0x7effbccec7bc
            |          g_main_context_iteration
            |          |          
            |           --2.16%--0x7effbb02519b
            |                     g_main_context_dispatch
            |                     0x7effbcced3c0
            |                     0x7effbcc96a50
            |                     QApplication::notify
            |                     QApplicationPrivate::notify_helper
            |                     QReadNotifier::event
            |                     QAbstractSocketPrivate::canReadNotification
            |                     |          
            |                     
--2.15%--QAbstractSocketPrivate::emitReadyRead
            |                                0x7effbccc1385
            |                                |          
            |                                 --2.15%--0x7effbcbd9560
            |          
            |--1.99%--g_main_context_iteration
            |          0x7effbb02519b
            |          g_main_context_dispatch
            |          0x7effbcced3c0
            |          0x7effbcc96a50
            |          QApplication::notify
            |          QApplicationPrivate::notify_helper
            |          QReadNotifier::event
            |          QAbstractSocketPrivate::canReadNotification
            |          QAbstractSocketPrivate::emitReadyRead
            |          0x7effbccc1385
            |          0x7effbccc14e3
            |          Akonadi::Connection::handleIncomingData
            |          0x7effbccc3bd2
            |          0x7effbccc3240
            |          
            |--1.77%--Akonadi::Connection::handleIncomingData
            |          0x7effbccc3bd2
            |          0x7effbccc3240
            |          
             --1.08%--0x7effbcc96a50
                       QApplication::notify
                       QApplicationPrivate::notify_helper
                       QReadNotifier::event
                       QAbstractSocketPrivate::canReadNotification
                       QAbstractSocketPrivate::emitReadyRead
                       0x7effbccc1385
                       0x7effbccc14e3
                       Akonadi::Connection::handleIncomingData
                       |          
                        --1.08%--0x7effbccc3bd2
                                  0x7effbccc3240

    97.82%     0.00%  SessionThread    libQt5Widgets.so.5.12.5            
            |
            ---QApplication::notify
               QApplicationPrivate::notify_helper
               QReadNotifier::event
               QAbstractSocketPrivate::canReadNotification
               |          
                --97.82%--QAbstractSocketPrivate::emitReadyRead
                          0x7effbccc1385
                          |          
                          |--95.66%--0x7effbccc14e3
                          |          |          
                          |          
--95.66%--Akonadi::Connection::handleIncomingData
                          |                     |          
                          |                      --95.45%--0x7effbccc3bd2
                          |                                |          
                          |                                
--95.44%--0x7effbccc3240
                          |          
                           --2.15%--0x7effbcbd9560

    97.82%     0.00%  SessionThread    libQt5Network.so.5.12.5            
            |          
             --97.82%--QReadNotifier::event
                       QAbstractSocketPrivate::canReadNotification
                       |          
                        --97.81%--QAbstractSocketPrivate::emitReadyRead
                                  0x7effbccc1385
                                  |          
                                  |--95.66%--0x7effbccc14e3
                                  |          |          
                                  |          
--95.66%--Akonadi::Connection::handleIncomingData
                                  |                     |          
                                  |                     
--95.45%--0x7effbccc3bd2
                                  |                                |          
                                  |                                
--95.44%--0x7effbccc3240
                                  |          
                                   --2.15%--0x7effbcbd9560

    97.44%     0.01%  SessionThread    libKF5AkonadiCore.so.5.14.1.abi2   
            |          
             --97.43%--Akonadi::Connection::handleIncomingData
                       |          
                        --97.22%--0x7effbccc3bd2
                                  |          
                                   --97.21%--0x7effbccc3240

     4.23%     0.01%  SessionThread    libglib-2.0.so.0.6200.4            
            |          
             --4.15%--g_main_context_iteration
                       |          
                        --4.15%--0x7effbb02519b
                                  g_main_context_dispatch
                                  0x7effbcced3c0
                                  0x7effbcc96a50
                                  QApplication::notify
                                  QApplicationPrivate::notify_helper
                                  QReadNotifier::event
                                  QAbstractSocketPrivate::canReadNotification
                                  |          
                                  
--4.15%--QAbstractSocketPrivate::emitReadyRead
                                             0x7effbccc1385
                                             |          
                                             |--2.15%--0x7effbcbd9560
                                             |          
                                              --1.99%--0x7effbccc14e3
                                                        |          
                                                        
--1.99%--Akonadi::Connection::handleIncomingData
                                                                  
0x7effbccc3bd2
                                                                  
0x7effbccc3240

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