user2785: It's impressive watching players like GM Andrew Tang play ultra bullet and puzzle rush at super-fast speeds without it being a complete mess.  I'm curious as to how they do it.  When I try, I physically can't move fast enough (I tend to do better on a touch screen): I can't envisage how it's possible to move so fast.
Question: Are there videos of the highly-skilled fast online players showing their mouse skills?

user29950: Yes, there are several.
As stated by @B.Swan, you can search for "Andrew Tang Mouse Speed". Here are a couple videos that come up.
https://www.youtube.com/watch?v=tGvgXH_SQtU
https://www.youtube.com/watch?v=EwP2nFbYm5c
https://www.youtube.com/watch?v=4nSyv0IY6gg
Another GM that comes to mind is Daniel Naroditsky, a well known chess streamer.
https://www.youtube.com/watch?v=pndmSw4Wq6Q

2785: <p>It's impressive watching players like GM Andrew Tang play ultra bullet and puzzle rush at super-fast speeds without it being a complete mess.  I'm curious as to how they do it.  When I try, I physically can't move fast enough (I tend to do better on a touch screen): I can't envisage how it's possible to move so fast.</p>
<p><strong>Question</strong>: Are there videos of the highly-skilled fast online players showing their mouse skills?</p>
 29950: <p>Yes, there are several.</p>
<p>As stated by @B.Swan, you can search for &quot;Andrew Tang Mouse Speed&quot;. Here are a couple videos that come up.<br />
<a href="https://www.youtube.com/watch?v=tGvgXH_SQtU" rel="nofollow noreferrer">https://www.youtube.com/watch?v=tGvgXH_SQtU</a><br />
<a href="https://www.youtube.com/watch?v=EwP2nFbYm5c" rel="nofollow noreferrer">https://www.youtube.com/watch?v=EwP2nFbYm5c</a><br />
<a href="https://www.youtube.com/watch?v=4nSyv0IY6gg" rel="nofollow noreferrer">https://www.youtube.com/watch?v=4nSyv0IY6gg</a></p>
<p>Another GM that comes to mind is Daniel Naroditsky, a well known chess streamer.
<a href="https://www.youtube.com/watch?v=pndmSw4Wq6Q" rel="nofollow noreferrer">https://www.youtube.com/watch?v=pndmSw4Wq6Q</a></p>
