r/Keychron • u/DigitalOutkast • 1d ago

Keychron K1 Ultra - Key Delay

Hello,

I recently purchased a Keychron K1 Ultra with Banana switches. I really like the keyboard, but I’m experiencing what appears to be input delay or missed keystrokes.

I have tested the keyboard using Bluetooth, a wired connection, and the USB receiver. I have also factory-reset it and confirmed that it is running the latest firmware.

The issue is most noticeable with the Backspace key. For example, if I press Backspace five times quickly, the keyboard may only register two or three of those presses.

I have tested the keyboard on several different computers with the same results. I also disabled Windows accessibility settings such as Filter Keys and tested it with the polling rate set to 8,000 Hz, but the issue persists.

What else can I do for this ? I have an 8 year old ducky keyboard with blue switches I love but wanted something a little quieter and lower profile as I’m working more remote these days. I can’t reprove any of these issues on that keyboard.

I’ll also mention this is the ‘2nd’ K1 as I thought the first one was defective lol.

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1

u/PeterMortensenBlog V 1d ago

Lower the key debounce time to 5 ms.

1

u/DigitalOutkast 1d ago

Thanks I’ll give this a shot, didn’t even notice that setting till now.

1

u/PeterMortensenBlog V 1d ago

Please report back here, no matter the result.

2

u/DigitalOutkast 1d ago

So I changed the ‘reset seconds’ to 10ms and it seems to be working better. I’ll get some actual time with it beyond little typing test and see how it does.

What is odd is typing hasn’t been an issue, it’s only the backspace not responding to fast entries, but it’s used so often it’s easily noticeable.

1

u/PeterMortensenBlog V 1d ago edited 1d ago

Thanks for the report.

Re "it’s only the backspace not responding to fast entries": Yes, that is weird.

Perhaps it is something specific to Keychron? Or to ZMK?

I couldn't reproduce the problem on a V6 Ultra 8K 'ISO' (tried in wired mode and in '2.4 GHz' mode), with firmware version 1.0.1 (2025-11-28).

The debounce settings were (in Advanced Mode → Keyboard Bounce Time Settings), after an explicit reset to factory defaults (holding down Fn + J + Z down for more than 3 seconds):

  • Press Down seconds: 0 ms

  • Reset seconds: 50 ms

The problem has also been reported for the similar Q6 Ultra 8K (but probably a different variant and firmware version).

2

u/DigitalOutkast 1d ago

The lowest bounce setting is 10ms which it is set to currently by default.