Keyboard polling rate matters, here's why | osu! & Etterna

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Let's talk about keyboards and polling rates today. It's a huger deal on games than most people think.
INFO AND LINKS:
Keyboard spreadsheet: docs.google.com/spreadsheets/...
Flash custom keyboard (QMK) to 1000hz: • [DEPRECATED] QMK Keybo... (senya didn't make the guide but someone else has here!)
Mina's WIFE FFR post: www.flashflashrevolution.com/v...
Etienne's WIFE3 video: • A Balanced Rhythm Game...
FAQ:
'What is inconsistent polling rate?'
I semi-explain it in a keyboard review here • (osu!) Hotswap Keyboar...
'Why don't you just use the keyboard scan rate website?'
Like what their website said, it does not test polling rate. It's not very accurate either depending on your keyboard. It determined my Happy Hacking Keyboard was 33.33hz when it's 125hz, I asked other HHKB owners to test as well and had the same results. So far without buying expensive equipment, Etterna gives the best estimate on keyboard polling rate.
'Is X keyboard 1000hz?'
If it's a gaming keyboard from a reputable gaming company that boasts of 1000hz in their marketing material, it most likely is. Not all gaming keyboards are great, but that's polling rate and chord splitting aside and reaches more of per-keyboard review territory. Otherwise, I don't know and you will have to test it yourself.
'But X player got X best score without 1000hz!'
Yeah, you can still do crazy things without a 1000hz keyboard, but with a better keyboard, at high levels it gives you more hit window space to work with.
CREDITS:
Senya - For taking part in this video and teaching me about polling rates, without him, I wouldn't have been able to make this video
Etienne ( / etiennesinsm ) - Without him, I would have never met Senya, he has good insight on keyboards as well
Etterna community - For caring about rhythm games and their keyboards so much and for helping out in the spreadsheet (I also think you guys might've had some help behind senya in communicating with me and allowing the spreadsheet to go public). Thank you!
Timestamps:
00:00 - Introduction
01:41 - Polling rate and its effects
04:42 - Chord splitting and its effects
08:05 - Keyboard spreadsheet
09:55 - Does polling rate matter on osu?
13:54 - osu! and pull rate
14:34 - Keyswitch debounce and chatter
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Ending Song | Omoi - Teo (remix by rN www.yuugenp.xyz/)
Thanks for watching!