It must be getting late or you're dead tired.
Pretty difficult to calculate trends with so few samples on the display.
Nope, it just doesn't work
Try it, then you'll get what I'm saying.
Or maybe this problem is only on my machine, then it's not a bug
some thoughts on this:
As for Period measurement, it do every cycle with one capture, when a lot of cycles show in one display, it's much faster than "cycle XXX", which are just measurements of the first cycle of one capture. Those "cycle XXX" does not rely on much waves in one capture, it only getting faster with faster sampling, and the best situation is put just one or two cycle on the display(no wasting time to capture the rest waves), then the "cycle XXX" is just as fast as Freq.
And the problem is not about acquisition speed or sample quantity, nor the waveform frequency. For comparison, ALL Period measurement will immediately show an outputs on "Track plot". It's just some kind of faster trend chart, but not in roll mode, also on trigger on it. A plain sinewave Means there is no time domain changes here, so a plain line output is expected, just as it do on Freq or Duty measurements.
Anyone can try this on his/her machine and feedback the result, so We can figure out if this is a bug
Since the 2000X+ can't do a Spectrogram display, this "Track plot" is very usefull to give us some insight on waveform changes in the time domain.