Only getting 300Mb/s download on D-LINK DIR-842 C3

[zhabi]

I'm having trouble with my internet speed after flashing OpenWRT on my router. Before i could pull 1000mb/s download speed in various speedtests, now i can only pull 250-300mb/s max 350mb/s. I'm not using QoS.

Does anyone know how to fix this?

[slh]

Your device is also using the single-core mips 74Kc QCA9563 SOC, so the same answer applies:

Archer A7 has abnormally slow speeds on both Ethernet and Wi-Fi

Single mips core clocked at 750 MHz (QCA9563), that's about the throughput you can get from such a device using a rather dated SOC. Enabling software flow-offloading should help a bit, but the ath79 target is only good for ~150 up to maybe ~200 MBit/s - faster WAN connections require higher end devices (and north of ~500 MBit/s the situation gets rather tight). The OEM firmware can make use of a combination of QCA fast-path (functionally similar to software flow-offloading, but implemented diff…

In other words, this is about the maximum you can get out of this hardware running OpenWrt.

[zhabi]

Would a Linksys WRT3200ACM be capable of throughputting 1000mb/s?

[slh]

To my knowledge (I don't own any mvebu devices), yes - but its wireless drivers/ firmware/ hardware (mwlwifi) is 'not good and end of life/ maintenance', to phrase it …politely.