Hello Grzegorz,
No, I do not have any trouble, is anyone else? No one else has reported problems!
Of course, YouTube is a Third Party and I have no control over the Speed at which they decide to load Video Frames.
Do you click on the link: 'Latest By' to open the page/thread? If you do, this loads the entire thread, and on big threads, it can be somewhat slow, on slow internet connections.
Long Threads do take time to load, yes. Your Browser uses your Computer RAM, Random Access Memory, when loading the Page,

and on Big Threads:

and if you are loading the entire thread, and on long threads like that thread, and if your Internet Connection is not fast enough, there can be some delays or even crashes if Chrome is expecting something to load when it does not.
Try to avoid posting off topic posts on Big Threads is a good idea! That Thread was Read only and I reopened the thread on request. All large threads should be locked and Read Only in my opinion.
Make sure you have lots of RAM installed, its cheap, so the more the better these days, 8Gb or more, 16Gb is about where I think most PC's / Laptops should be these days. I have 32Gb RAM currently.
Update your version of Chrome: Here is the latest version.
Check your internet connection, run a speed test, to see if you're having any bandwidth problems. Here is mine, in a WiFi Connection.

If you're still having trouble, maybe worth getting your computer checked by a Technician.
I hope this helps!
Best Wishes,
Chris