Crosshair performance over a huge XYZDataset

[permiakover]

Hello, I'm using a spectrogram like plots that consists of XYZDataset with huge amount of processed data.
view for example:

x.lenght * y.length = 897 122 304‬ and each has z value (color intensity).

I need a tool like domain crosshair on chartMouseEventFX to highlight data. When the amount of data grows I got terrible time lags of the crosshair.
But when I apply this crosshair on empty dataset it works fine in the same ranges of AxisRange and DomainRange. I understand that the lag reason is a computations with java2DToValue over dataArea.
Is there a way to get "domain axis specific" value from chartMouseEventFX to avoid excessive computations of filled dataArea?

[permiakover]

but most likely it is issue of ChartMouseEventFX performance