I just bought a Linksys EA8300, and put openwrt on it, and checking the wifi connections and I'm getting 190~mbs on the 5ghz one (Even while standing next to the router), while on the ISP (shitty) router wifi I'm getting 300mbs.
Tried
Lowering the tx power
Enabling only one radio
No security
Force 40hz
Trying to use the other 5ghz radio (gives same speeds)
I am not familiar with that router,
With that said,
You can see if enabling software flow offload improves performance,
Network > Firewall > Software flow offloading
Is this on 5 GHz? If you're on 5 GHz, why not use 80 MHz?
Forcing 40 MHz on 2,4 GHz is antisocial and a bad idea altogether (you'll only create more interference and your network stability won't necessarily improve, much to the contrary).
That is only true if you live in a contested environment (and also is true for 80MHz or 160 MHz for 5G btw.). There are many people out there in the woods, living in small villages with big houses though. There is no competition for wireless channels in these remote areas.
No, I'm not forcing 40 Mhz currently, I said I tried with that option on to see if anything changed.
Ok, the software offloading I was already doing it on suggestion of the first post. Irqbalance I already had it installed, but didn't know that I needed to activate it, after activating it, speed went to 290mbps so I would say that is more that acceptable.
But I was searching for more info on the forums and it seems the speed problem on radios started on v20-21 where DSA stopped using multi cpu. (More info here). Supposedly fixing that is a work in progress.