Would you think after 5 years that CPU got more powerful ?
Also keep in mind that specific device was released in 2013. Ten years ago.
If you don't use that virtual interface, leave it disabled so whatever processing power the CPU has to offer, can be directed towards the used interfaces.
Also, if you do not use any of the specific ROS7 features, it might be possible you get better performance when staying on ROS6 for that device.
ROS7 is quite a bit heavier then ROS6. Again additional load on CPU.
I would try that first.
Jaja, like a good wine you say? no... I
know it will not get powerful my good friend. What I have just realized now, that
before not, happens because I used to have 100mbits bandwith (here in Argentina bandwith is very little compared with maybe yours).
So now that I have 300Mbits, is the time I realized that this router behave like I post before your kind answer.
Just disabled the virtual guest wifi interface and as I post before for the sake of helping another lost soul... that makes the router crawl.