KConfig->reparseConfiguration is expensive. It throws away our cached
values.
The Units constructor was calling this every single time. Units is
created a _lot_; once per applet and once per FrameSVGItem.
This meant we were reloading the same config ~100 times on startup for
no reason.
Perf showed this as being ~5% of the total startup time.
- 7.47% 0.00% plasmashell libKF5ConfigCore.so.5.5.0
[.] KConfig::reparseConfiguration()
- KConfig::reparseConfiguration()
+ 66.51% Units::settingsFileChanged(QString const&)
+ 25.95% KConfig::KConfig(QString const&,
QFlags<KConfig::OpenFlag>, QStandardPaths::StandardLocation)
+ 3.93% KDesktopFile::KDesktopFile(QString const&)
+ 3.61% Units::settingsFileChanged(QString const&)
Change-Id: Ia70b7001ba473c8063e6c999b8e4233ea5b206f5
901cc3e159