Official comment
It does run on a retina, but I'm going to direct you to file a support inquiry so our rekordbox team can communicate directly with you to troubleshoot this issue.
I own 2 Macbooks Pro
1 Macbook Pro 13 (2012) I5 2.5 with Sierra and 16 GB RAM 1 TB SSD and in this computer Rekordbox works perfectly with the DDJ-RZX
1 Macbook Pro Retina 15 (2013) i7 (2.7 Quad) with 16 GB and SSD 512. I tested with El Capitan and Sierra! With Intel graphics card (HD 4000) and GY 650M.
I tested it up to Beta 4.3.1. Operating on this machine that is far superior to the one already mentioned is awful! Stop responding! The screen slows down! Audio short! I disabled video acceleration! Nothing! In all programs this machine runs perfectly! Serato DJ with DJM-S9, DJM 900NXS2, DDJ-SZ! But with RZX you can not use it! Impossible!
When will you actually have a version of Rekordbox that can run on Macbook Pro Retina?
It does run on a retina, but I'm going to direct you to file a support inquiry so our rekordbox team can communicate directly with you to troubleshoot this issue.
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