[FS#907] slow download - add

[LEDE Bugs]

The following task has a new comment added:

FS#907 - slow download - add
User who did this - Jo-Philipp Wich (jow-)

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LEDE buildroot relies on curl or wget to retrieve files. As long as these tools do not support parellization, LEDE does neither.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=907#comment3198