Why can't I download all files at high speed when I can stream HD YouTube videos without buffering?

I recently got a new inteet connection. When I am watching videos on YouTube, there is no buffering for 720p or 1080p videos. If I download these videos using YouTube Download Manager, I get a download speed of 1MB/s.

However, If I download anything else from any other sites, my download speed is almost always below 100KB/s. Why does this happen? I have tried using IDM as well. Nothing increases my download speed. What can be the reason for such high download speeds for YouTube videos but nothing else.

When I use some other inteet connection, I get the same High speed everywhere.

I am using Window 10 if that matters. Let me know if I need to add more details, this is my first question.

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