[Akonadi] [Bug 422336] kmail: the access and reading of the received messages is often very slow

[Martin Steigerwald]

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

--- Comment #11 from Martin Steigerwald <Martin at Lichtvoll.de> ---
(In reply to Martin Steigerwald from comment #10)
> Marc, thank you a lot for your analysis in comment #2. I just noticed it
> now. I bet it can be valuable help for the developers to pinpoint the issue.

I can confirm your finding with perf top:

Samples
Overhead  Shared Object                         Symbol
  65,66%  libQt5Core.so.5.12.5                  [.]
QMetaObjectPrivate::disconnect
   5,87%  [kernel]                              [k] 0xffffffff81737191
   2,07%  libQt5Core.so.5.12.5                  [.] QMetaObject::activate
   1,58%  i965_dri.so                           [.] linear_to_ytiled_faster
   0,66%  libKF5MessageList.so.5.14.1.abi1      [.]
MessageList::Core::Item::parent
   0,59%  libQt5WebEngineCore.so.5.12.5         [.] exec_ops
   0,48%  libQt5Gui.so.5.12.5                   [.] qt_alphamapblit_argb32
   0,39%  libKF5MessageList.so.5.14.1.abi1      [.]
MessageList::Core::Item::indexOfChildItem
   0,35%  libQt5Gui.so.5.12.5                   [.] qt_memfill32
   0,31%  libKF5MessageList.so.5.14.1.abi1      [.]
MessageList::Core::Item::type
   0,25%  libc-2.30.so                          [.] _int_malloc

Samples
Overhead  Shared Object                         Symbol
  72,54%  libQt5Core.so.5.12.5                           [.]
QMetaObjectPrivate::disconnect
   4,87%  [kernel]                                       [k] 0xffffffff81737191
   1,72%  libQt5Core.so.5.12.5                           [.]
QMetaObject::activate
   0,74%  libKF5MessageList.so.5.14.1.abi1               [.]
MessageList::Core::Item::parent
   0,56%  libKF5MessageList.so.5.14.1.abi1               [.]
MessageList::Core::Item::indexOfChildItem
   0,52%  perf_5.6                                       [.] 0x000000000033fe21
   0,48%  perf_5.6                                       [.] 0x0000000000275703
   0,36%  i965_dri.so                                    [.]
linear_to_ytiled_faster
   0,30%  libQt5Core.so.5.12.5                           [.]
QAbstractItemModelPrivate::rowsAboutToBeInserted
   0,30%  libQt5Core.so.5.12.5                           [.]
QAbstractItemModelPrivate::rowsAboutToBeRemoved
   0,23%  libQt5Core.so.5.12.5                           [.] bm_find

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