Official comment
Good news! As of rekordbox 5.0.2 they introduced a new setting to get things back to the way they were in 4.3!

Hi everybody,
in 4.1 the waveform is terrible and not like the other versions. It means: when i change the tempo, the waveform goes faster or slowlier, before the update the Waveform goes greater or smaller!!!!! and this is good, look Versions (3.0-4.08) of RB.
Why you change this, it is not good.
I hope it is a issue and not a feature.
Andre
Good news! As of rekordbox 5.0.2 they introduced a new setting to get things back to the way they were in 4.3!

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UPDATE
i have disabled the DVS Mode and now the Waveforms going greater and smaller when i change the tempo. In DVS Mode the Waveforms goes faster and slowlier.
Have anybody else this problem??
Andre
Update
sorry, i mean the waveform is sqashed and scretched (not greater and smaller)
my english is not so good :-(
Thanks, this helped me fix my issue!