[FS#929] mt7620 abysmal wifi performance

[LEDE Bugs]

The following task has a new comment added:

FS#929 - mt7620 abysmal wifi performance
User who did this - Amir Sabbaghi (amir-sabbaghi)

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I have found the commit that causes the drop in speed: https://github.com/lede-project/source/commit/4314646ac6343af3c9e813e6505b5ef072d2a714
It's previous commit has more than 60Mbps throughput but after this commit drops to less than 20 Mbps.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=929#comment3612