This causes the focal point zooming to not work (as the focal point is
lost). There's no need to handle ongoing changes to
`BeatmapInfo.TimelineZoom` because it is not a property which is changed
at runtime.
It wasn't made to be updated every frame, and it shows. Inaccurate for
reasons I'm not really interested in investigating, because I don't want
to incur the `Transorm` overhead in the first place for an fps counter.
Was only used originally out of convenience.