[kmail2] [Bug 425433] New: HTML Preview is slow (for some messages)

[Daniel Schulte]

https://bugs.kde.org/show_bug.cgi?id=425433

            Bug ID: 425433
           Summary: HTML Preview is slow (for some messages)
           Product: kmail2
           Version: 5.15.0
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: trilader+kdebugs at gmail.com
  Target Milestone: ---

SUMMARY
For some messages rendering the HTML preview is slow. After selecting the
message it takes about 2.2 seconds (measured with stopwatch) before the message
content is visible. If switching between messages the old message content is
displayed while the message list already shows the new message as selected.

For some messages it's faster but still takes around a second.
The same message in Thunderbird load with no noticeable delay.

STEPS TO REPRODUCE
1. Open/switch to a message from a sender which is set to display as HTML by
default
2. Wait..
3. See that it took some time to display it.

OBSERVED RESULT
Rendering the HTML message is slow.

EXPECTED RESULT
It should be fast :-)

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.19.4
KDE Frameworks Version: 5.73.0
Qt Version: 5.15.0

ADDITIONAL INFORMATION
I can supply messages to test with.

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