Thanks for your suggestions. I managed to configure my Pi 4 B, disabled WiFi, overclocked to 2.2 GHz, mounted a nice maneged switch from tp-link and as access point 4 mesh nodes Linksys MX10. The bufferbloat is 0 ms in download and upload using SQM cake limiting 5% of maximum bandwidth. For my Gigabit I think I can not do better.
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