Update 2022 May 18

Added a screenshot shoot in Ver 1.18.32.(GAME_20220518-212739_1.mp4) Redstone tick of redstone repeater is 4 each but the music rethm is not constant.

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Update 2022 Feb 15

Added a screenshot shoot in Ver 1.18.10. I think you can understand the rhythm is not constant (especially 0:04~0:13 is obvious.)

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I am making songs with noteblocks. I got my new phone, copied my worlds to new one and found noteblocks won't play sounds smoothly in new phone, it was laggy. My new one has higher-spec than old ones and noteblocks played well in old ones, so I can't understand.

I don't use any mods in this world. I tryed minimal chunks(4 chunks), high-performance mode in my phone settings but nothing changed. The world is 0.19MB big, so it's not big. Overheat is not a problem since this lag happens from the first second. Also RAM is free enough.

In old phone I saved my worlds data at Application and I changed it to External (Internal Storage) in new one, and I guess maybe it occurrs this problem. If it is, I hope this performance problem get solved in future releases.

Phone specs:

New
Xperia 1 Mark 2
CPU: Snapdragon 865 5G RAM:12GB Not using microSD card

Old
HUAWEI Mate 20 Pro
CPU: Kirin 980 RAM:6GB Not using microSD card

I attached a screenshot, I think you can understand the rhythm is not constant (originally constant).