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What is the purpose of your issue?
I Wonder is Fragments Downloader Use single thread ?
My speed can up to 4 mb/s for download single youtube mp4 file .
But if it is fragments , the speed will just 100 ~ 900kb/s .
I think it's because there is only one thread for download all fragments and it will make connection | create the file | download | finish the connection for every single fragments .
It will useful if there is 10 thread and each thread download 1 fragments . (something like that)
You guys did a great job , thanks .