My connection has been so bad this last month. At least to provide something constructive, I recorded clips of myself in World of Chel free skate mode to show the difference between with the delay feel and without. Obviously, things like pickups and battles and pokes and passes aren't present, which all magnify the issue, especially in competitive scenarios.
All of these clips were taken early morning, in non-peak hours. I shot the delayed clips, and after clearing my cache and hard resetting my Series X ten times, I did a factory reset, waited half an hour, and I started playing again.
THE BAD:
Here I am, just moving the left stick. The first clip (4 seconds), I'm simply going from 2 to 10 to 2 on my left stick, holding forward the entire time. It feels sluggish, which is hard to capture, but you can see my player STOP skating when I make the 2nd move. He stops and turns backwards, like it never inputted. It does this every time I have my delay, which is every night now. It's beyond a heaviness or slipperiness to my inputs, which are there: it's like the input data itself is not being transferred. I've played on 220 ping against a player in Hong Kong before; this is just different. Maybe delay isn't even the best word.
https://i.imgur.com/B6s7l4Z.mp4
Here is a longer clip of the same thing, again I am holding my stick forward, not going to true center or backwards:
https://i.imgur.com/xxompQY.mp4
THE GOOD:
So, I factory reset my console, reset my modem, everything possible. In all likelihood, it's coincidental. Eventually, I returned to my normal non-delay connection. It's instantly viewable how much snappier my player moves, and he stops doing strange stops and turns. Again, feel-wise, I instantly know the lack of delay.
https://i.imgur.com/szYHbLt.mp4
https://i.imgur.com/6MQHxRr.mp4
This is World of Chel practice mode. By the next evening, it was delayed as usual. And the next, and the next. I have tried several controllers plugged-in, I have a new monitor, new HDMI cables, new ethernet cable (I played hardwired, but it's no better than WiFI). My internet speeds never vary. Sometimes clearing my cache works, usually it doesn't. There's essentially no rhyme or reason when I don't get my delay. As of now, it's just 95% of the time. No other game has this happen, as has been stated previously. This is the best I can do to portray the difference between my normal connection and my troubled one in a visual way. And it's unbelievably worse in game against players apparently suffering no issues.