[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 - psyborg55 (psyborg55)

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use same settings when doing test, especially channel.

72/85 dl/ul in my case after reverting his mess-up
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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#comment3163