Hmmm...I am using a Netgear R7800 with 2x 1700 Mhz and the cycling effect of generating a load >2 peaks to 4 was irritating and I wouldn't categorize the router I am using as low end and "resource limited" ignoring for one minute that every thing is limited, even the lifetime of the sun ;- )
But I am not sure how these load peaks influenced the rest of the routers routing performance
Here is a fine speed test script monitoring latency and cpu load so running this script with and without an opened luci overview site would be interesting.
PS: ok, universe seems to be endless and stupidity of some people including myself (sometimes ;- )