Submission + - Comcast Confirms Bufferbloat is Real; Makes a Fix Available (arxiv.org) 1
... As explained earlier, for two variants of XB6 cable modem gateway, upstream DOCSIS-PIE AQM was enabled on the CGM4140COM (experiment) variant but was not available on the TG3482G (control) variant during the measurement period
...
At a high level, when a device had AQM it consistently experienced between 15-30 milliseconds of latency under load.
... [The] non-AQM devices experienced in many cases 250 milliseconds or higher latency under load.
See if you can get an XB6 / CGM4140COM cable modem