Media & TV2 mins ago
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rowanwitch it says Download 3.3 Mbps Upload 509.6 Kbps Latency 39ms.
spathiphyllum That's it, buffering, I couldn't think what it was called. I will try pausing it as you suggested and see if that works.
Start Windows Task Manager and have only your favourite browser showing a YouTube video running. Look at the performance graph on Task Manager. Now pause the video and look again at Task Manager and you will see the usage drop. If the usage is very high when the video is running that could be your problem, not the broadband speed.