Business relationships between major broadband providers and Internet backbone providers appear to be the cause of major drags on performance from early 2013 to early this year, according to a new study from a think tank advocating for strong net neutrality rules.

Five major U.S. broadband providers, including Comcast, AT&T and Verizon Communications, saw major performance degradation during those months, according to the study published Tuesday by the New America Foundation’s Measurement Lab Consortium [M-Lab].

Broadband providers questioned the study, saying it wasn’t able to pinpoint the exact cause of congestion.

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