Zyxel wsm20 mt7621 wireless speed not go up the 500 mbits

Installing and Using OpenWrt
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I have a Zyxel WSM20 with an MT7621 processor. I've searched forums but couldn't find a solution about not go above 500 Mbps wirelessly. My lineis 1 Gbit/s. How can I remove this limitationon wireless to go up to 900 mbits etc? If it can't be removed, I'll change devices.

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This.......

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In theory on a completely "green" channel you can get 8/9ths of 1201Mbps ie gigabit in up+down, exactly half of yor wire speed.
500Mbps - is it with offload already? Or just the displayed link speed?

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This is the speed result I saw on the speedtest.

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Which devices would you recommend?

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Depends on where you live.

Globally, GL-MT6000
US: SAX1V1K (W1700k if you want to gamble, support is still WIP)
EU: EX5601-T0/-T1 or ISP branded versions of those two.

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My Asus RT-N56U B1 with MT7621ST (single core) gives 350 Mbps maximum at 100% CPU load when used as Dumb AP (no firewall, no nftables, just clean passthrough eth->wifi). Your's Zyxel has MT7621AT (dual core), and I think 500-550 Mbps is practical maximum for it.

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