Official comment
Sorry to hear that, please file an inquiry ticket here and our rekordbox support team will be able to gather some additional information to assist you in resolving this issue.
I and at least one other person I am aware of have been experiencing jerky waveform scrolling since moving to RB 5.4.1 / Mojave 10.14.
Draw rate is set to "High Speed". We both have core i7 MacBook pro's.
The issue is intermittent and seems to occur when dragging a track from a playlist up to a player. Sometimes the waveform is scrolling is smooth and after I drag in a new track it becomes jerky. Sometimes it is jerky scrolling, then loading a new track causes the scroll to smooth.
I am happy to provide further details if requested by support. If any other users are also having this problem please comment to let us know.
Sorry to hear that, please file an inquiry ticket here and our rekordbox support team will be able to gather some additional information to assist you in resolving this issue.
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Here is a video to demonstrate that the issue can be replicated.