click on the search bar at the bottom and type - cmd <ENTER>
The when it open up the DOS window type : ping -t
www.youtube.com <ENTER>
It will start pinging the website. I want to see what the latency is from your machine and whether there is any delay or packet loss. This is sounding more and more like an issue with your NIC, and as Adrian says above, that screen of Youtube homepage suggests slowness in loading and rendering the HTML of the page.
Once that ping has been running for 60 seconds press ctrl+c which will stop it. Then please either screenshot the DOS window or copy and paste the pings AND the summary results at the bottom into here please.
It will look something like this (a little different in the summary because this is on my Mac).
mark@apples-iMac ~ % ping
www.youtube.com
PING youtube-ui.l.google.com (142.250.187.206): 56 data bytes
64 bytes from 142.250.187.206: icmp_seq=33 ttl=117 time=21.981 ms
64 bytes from 142.250.187.206: icmp_seq=34 ttl=117 time=23.328 ms
64 bytes from 142.250.187.206: icmp_seq=35 ttl=117 time=22.137 ms
64 bytes from 142.250.187.206: icmp_seq=36 ttl=117 time=19.368 ms
64 bytes from 142.250.187.206: icmp_seq=37 ttl=117 time=21.247 ms
64 bytes from 142.250.187.206: icmp_seq=38 ttl=117 time=16.672 ms
64 bytes from 142.250.187.206: icmp_seq=39 ttl=117 time=20.412 ms
64 bytes from 142.250.187.206: icmp_seq=40 ttl=117 time=21.668 ms
64 bytes from 142.250.187.206: icmp_seq=41 ttl=117 time=20.096 ms
64 bytes from 142.250.187.206: icmp_seq=42 ttl=117 time=27.584 ms
64 bytes from 142.250.187.206: icmp_seq=43 ttl=117 time=29.005 ms
64 bytes from 142.250.187.206: icmp_seq=44 ttl=117 time=28.740 ms
64 bytes from 142.250.187.206: icmp_seq=45 ttl=117 time=27.292 ms
64 bytes from 142.250.187.206: icmp_seq=46 ttl=117 time=30.902 ms
64 bytes from 142.250.187.206: icmp_seq=47 ttl=117 time=24.853 ms
64 bytes from 142.250.187.206: icmp_seq=48 ttl=117 time=35.512 ms
64 bytes from 142.250.187.206: icmp_seq=49 ttl=117 time=19.331 ms
64 bytes from 142.250.187.206: icmp_seq=50 ttl=117 time=28.849 ms
64 bytes from 142.250.187.206: icmp_seq=51 ttl=117 time=25.111 ms
64 bytes from 142.250.187.206: icmp_seq=52 ttl=117 time=24.402 ms
64 bytes from 142.250.187.206: icmp_seq=53 ttl=117 time=24.789 ms
64 bytes from 142.250.187.206: icmp_seq=54 ttl=117 time=25.539 ms
64 bytes from 142.250.187.206: icmp_seq=55 ttl=117 time=29.786 ms
64 bytes from 142.250.187.206: icmp_seq=56 ttl=117 time=27.115 ms
64 bytes from 142.250.187.206: icmp_seq=57 ttl=117 time=27.450 ms
64 bytes from 142.250.187.206: icmp_seq=58 ttl=117 time=28.046 ms
64 bytes from 142.250.187.206: icmp_seq=59 ttl=117 time=29.174 ms
64 bytes from 142.250.187.206: icmp_seq=60 ttl=117 time=25.931 ms
64 bytes from 142.250.187.206: icmp_seq=61 ttl=117 time=20.088 ms
64 bytes from 142.250.187.206: icmp_seq=62 ttl=117 time=21.673 ms
64 bytes from 142.250.187.206: icmp_seq=63 ttl=117 time=27.409 ms
64 bytes from 142.250.187.206: icmp_seq=64 ttl=117 time=21.602 ms
64 bytes from 142.250.187.206: icmp_seq=65 ttl=117 time=21.249 ms
64 bytes from 142.250.187.206: icmp_seq=66 ttl=117 time=17.853 ms
64 bytes from 142.250.187.206: icmp_seq=67 ttl=117 time=22.889 ms
64 bytes from 142.250.187.206: icmp_seq=68 ttl=117 time=23.928 ms
64 bytes from 142.250.187.206: icmp_seq=69 ttl=117 time=24.642 ms
64 bytes from 142.250.187.206: icmp_seq=70 ttl=117 time=20.169 ms
64 bytes from 142.250.187.206: icmp_seq=71 ttl=117 time=20.230 ms
64 bytes from 142.250.187.206: icmp_seq=72 ttl=117 time=20.051 ms
64 bytes from 142.250.187.206: icmp_seq=73 ttl=117 time=20.675 ms
64 bytes from 142.250.187.206: icmp_seq=74 ttl=117 time=22.149 ms
64 bytes from 142.250.187.206: icmp_seq=75 ttl=117 time=33.953 ms
64 bytes from 142.250.187.206: icmp_seq=76 ttl=117 time=18.028 ms
64 bytes from 142.250.187.206: icmp_seq=77 ttl=117 time=25.247 ms
64 bytes from 142.250.187.206: icmp_seq=78 ttl=117 time=20.512 ms
64 bytes from 142.250.187.206: icmp_seq=79 ttl=117 time=19.627 ms
64 bytes from 142.250.187.206: icmp_seq=80 ttl=117 time=21.294 ms
64 bytes from 142.250.187.206: icmp_seq=81 ttl=117 time=28.982 ms
64 bytes from 142.250.187.206: icmp_seq=82 ttl=117 time=20.260 ms
64 bytes from 142.250.187.206: icmp_seq=83 ttl=117 time=33.010 ms
64 bytes from 142.250.187.206: icmp_seq=84 ttl=117 time=21.816 ms
64 bytes from 142.250.187.206: icmp_seq=85 ttl=117 time=21.128 ms
64 bytes from 142.250.187.206: icmp_seq=86 ttl=117 time=36.224 ms
64 bytes from 142.250.187.206: icmp_seq=87 ttl=117 time=25.954 ms
64 bytes from 142.250.187.206: icmp_seq=88 ttl=117 time=25.139 ms
64 bytes from 142.250.187.206: icmp_seq=89 ttl=117 time=22.023 ms
64 bytes from 142.250.187.206: icmp_seq=90 ttl=117 time=21.692 ms
64 bytes from 142.250.187.206: icmp_seq=91 ttl=117 time=22.137 ms
64 bytes from 142.250.187.206: icmp_seq=92 ttl=117 time=22.025 ms
64 bytes from 142.250.187.206: icmp_seq=93 ttl=117 time=22.050 ms
64 bytes from 142.250.187.206: icmp_seq=94 ttl=117 time=26.984 ms
64 bytes from 142.250.187.206: icmp_seq=95 ttl=117 time=30.241 ms
64 bytes from 142.250.187.206: icmp_seq=96 ttl=117 time=30.960 ms
64 bytes from 142.250.187.206: icmp_seq=97 ttl=117 time=38.130 ms
64 bytes from 142.250.187.206: icmp_seq=98 ttl=117 time=23.643 ms
64 bytes from 142.250.187.206: icmp_seq=99 ttl=117 time=24.458 ms
64 bytes from 142.250.187.206: icmp_seq=100 ttl=117 time=20.541 ms
64 bytes from 142.250.187.206: icmp_seq=101 ttl=117 time=212.594 ms
64 bytes from 142.250.187.206: icmp_seq=102 ttl=117 time=21.004 ms
64 bytes from 142.250.187.206: icmp_seq=103 ttl=117 time=31.279 ms
64 bytes from 142.250.187.206: icmp_seq=104 ttl=117 time=19.599 ms
64 bytes from 142.250.187.206: icmp_seq=105 ttl=117 time=18.777 ms
^C
--- youtube-ui.l.google.com ping statistics ---
106 packets transmitted, 106 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 16.672/27.797/212.594/19.317 ms