Performance of MenuItem.highlighted binding

I noticed a considerable lag when interacting with the Qt Quick Controls Menu both on Windows and Linux. I ran the QML profiler to get some insight what might cause this delay. I observed a strange asymmetry when evaluating the highlighted property of the MenuItem.

I'm using a custom styled MenuItem with an IconImage for each the indicator and the arrow item. Both have the color property bound like this:

color: control.highlighted ? "white" : "blue"

According to the QML profiler the binding of the IconImage in the arrow item takes 172µs on average while the binding of the IconImage in the indicator item takes 5.85ms – that's more than 34 times longer.

While this is not the cause for the lag (it's still there even if I remove the binding) I wonder if this might hint at a hidden problem.