No QoS, no bandwidth limiterDon't waste your time with this website. A lot of people purchased needless hardware based on unrealistic stress conditions testing. For 300/50 ISP line Asuswrt-Merlin and Cake... in case QoS is needed for some reason. Not available in Asuswrt. Just Bandwidth Limiter in stock Asuswrt may show significant improvements in this fake Waveform test... just because it prevents maxing out the line bandwidth.
But I do own a top of the line cable modem (CM3000).
I have personally tested many cable modems and just a modem with better components inside can make a difference in bufferbloat.
Plus my ISP is now using LLD.