Very odd behavior Delay in moving a note up or down in key editor using Keyboard

Cubase
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1

I’m wondering if anyone else is seeing this on macOS 26.2 with Cubase 15 Pro.

Hardware

  • MacBook Air (M4, 24GB RAM, 512GB SSD) — same issue

  • MacBook Pro (M3 Pro, 18GB RAM, 1TB SSD) — same issue

Both machines are very fast and essentially “clean” systems (Cubase is the main workload).

Issue (MIDI Key Editor)

In the MIDI Key Editor, when I select a note and try to move it up/down using the arrow keys:

  • The first up/down movement has a large delay (around 3–4 seconds) before the note actually shifts pitch.

  • After that, if I use the left/right arrow keys (or continue moving after the first lag), everything responds instantly.

  • But if I click a note again with the mouse, and then press up/down, the delay returns (sometimes smaller, but still noticeable).

So it seems like the first up/down pitch move after a mouse selection triggers a lag, while subsequent edits are immediate.

Has anyone else experienced this, or found a setting/workaround?

2

No one with the Mac experiencing this???

3

A friend of mine encountered the same issue. M4 MBA 13’ & M5 MBP 14’, On macOS 26 Tahoe only, no issue with M4 MBA 13’ macOS 15 Sequoia.

4

Thank you for reading and thank you for replying…
So MacOs issue, not cubase…. hummm hope someone apple/steinberg can fix it, it’s is very annoying.

5

I have an M5 MacBook Pro 14 inch running macOS 26.3 and Cubase 15.0.10. There is a noticeable delay when moving a note up or down with arrow keys after clicking a note, but no delay when moving notes by dragging a selection box. My friend’s M2 Max 16 inch, also running macOS 26.3, doesn’t seem to have this issue.

6

Ever since I upgraded to Mac OS 26.4 this has improved significantly, cubase 15.0.10 but I just started playing with the new OS update, will update this thread if I see any major issues with it.
Try 26.4…

7

just updated the Cubase to 15.0.20 and the delay is back, it was significantly less with the older version 15.0.10. Another observation if the project is bigger and the P-cores are active, there is no delay….