Less speed when connected to wifi network

I have TP-Link C5 with openwrt installed,
I have connected router to internet using RNDIS coming from Android 5G phone.

On phone I get 250Mbps
When I connect phone directly to PC via RNDIS, I get 250Mbps
but when I access internet coming through openwrt 5ghz wi-fi access point I get only 60Mbps

I wonder why is this?

PS: I talked with the network ISP and they do not throttle the speed, its something related to openwrt

that's pretty good for a 867Mbps AC radio, want higher speeds, get a device with faster radios.

got it,
now I connected to PC directly through LAN, still I get only 60Mbps

for some reason ethernet max speed shown is 100Mbps

Archer C5 has 1000 Mbps LAN port

you can't achieve 60MB/s using a 100MBit connection.

as for the speed, you're probably maxing out the router's CPU.

typo, its Mbps, corrected

not able to get what you said,

phone<--usb cable-->PC I get 250Mbps
phone<--usb cable-->OpenWrt<--LAN cable-->PC I get only 60Mbps

quite strange, I wonder if its possible to get the same high speed as direct USB RNDIS connection

I could imagine the USB port keeping you back...

As frollic said, USB is rather CPU intensive - and most routers (especially ath79) are rather weak in that regard (and with USB2 ports, it's even worse).

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