This is what a PUMA6 intel chipset modem does to your latency, This causes jitter in games voice chat and virtual meetings. This is a major issue to quality of service. Using
Why your gigabit broadband lags like hell – blame Intel's chipset • The Register
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Complete List of the Bad Intel Puma 6 & Puma 7 Modems
2019: Are the Puma 6 modems fixed yet? : r/HomeNetworking