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Having MBP 15" 2018 upgraded from Catalina to Big Sur. I notice that the WiFi networking slows down and suffers huge amount of packet loss. Turning off and back on the WiFi on the mac solves the problem for a while after which again I've a lot of packet loss. A MacBook Air M1 and my iPhone on the same WiFi network run stable, without any packet loss. See: (drroot) [136] ping lxplus.cern.ch PING lxplus.cern.ch (188.185.86.233): 56 data bytes 64 bytes from 188.185.86.233: icmpseq=0 ttl=54 time=14.388 ms Request timeout for icmpseq 1 Request timeout for icmpseq 2 Request timeout for icmpseq 3 64 bytes from 188.185.86.233: icmpseq=4 ttl=54 time=11.279 ms 64 bytes from 188.185.86.233: icmpseq=5 ttl=54 time=30.184 ms Request timeout for icmpseq 6 Request timeout for icmpseq 7 Request timeout for icmpseq 8 Request timeout for icmpseq 9 64 bytes from 188.185.86.233: icmpseq=10 ttl=54 time=36.931 ms Request timeout for icmpseq 11 64 bytes from 188.185.86.233: icmpseq=12 ttl=54 time=77.474 ms Request timeout for icmpseq 13 Request timeout for icmpseq 14 ^C-- lxplus.cern.ch ping statistics 16 packets transmitted, 5 packets received, 68.8% packet loss round-trip min/avg/max/stddev = 11.279/34.051/77.474/23.723 ms After WiFi off/on on the mac: (drroot) [137] ping lxplus.cern.ch PING lxplus.cern.ch (188.185.90.109): 56 data bytes 64 bytes from 188.185.90.109: icmpseq=0 ttl=54 time=7.194 ms 64 bytes from 188.185.90.109: icmpseq=1 ttl=54 time=19.969 ms 64 bytes from 188.185.90.109: icmpseq=2 ttl=54 time=8.371 ms 64 bytes from 188.185.90.109: icmpseq=3 ttl=54 time=9.240 ms 64 bytes from 188.185.90.109: icmpseq=4 ttl=54 time=9.573 ms 64 bytes from 188.185.90.109: icmpseq=5 ttl=54 time=7.506 ms 64 bytes from 188.185.90.109: icmpseq=6 ttl=54 time=6.994 ms 64 bytes from 188.185.90.109: icmpseq=7 ttl=54 time=17.107 ms 64 bytes from 188.185.90.109: icmpseq=8 ttl=54 time=16.013 ms 64 bytes from 188.185.90.109: icmpseq=9 ttl=54 time=15.216 ms 64 bytes from 188.185.90.109: icmpseq=10 ttl=54 time=14.521 ms 64 bytes from 188.185.90.109: icmp_seq=11 ttl=54 time=9.223 ms ^C Is this a known issue? The answers in this thread don't show packet loss, but the effect of losing WiFi connection is the same. Cheers, Fons.