WiFi request far slower than Ethernet

Official Hardware Portenta Family Portenta H7
2

Yes, I recognize the much larger WiFi latency than Ethernet, even in local network.

Hereafter is the ping results to compare

  1. WiFi
kh@kh-Inspiron-3593:~$ ping portenta-h7-m7.local
PING portenta-h7-m7.local (192.168.2.94) 56(84) bytes of data.
64 bytes from 192.168.2.94 (192.168.2.94): icmp_seq=1 ttl=255 time=49.4 ms
64 bytes from 192.168.2.94 (192.168.2.94): icmp_seq=2 ttl=255 time=153 ms
64 bytes from 192.168.2.94 (192.168.2.94): icmp_seq=3 ttl=255 time=73.4 ms
64 bytes from 192.168.2.94 (192.168.2.94): icmp_seq=4 ttl=255 time=95.7 ms
64 bytes from 192.168.2.94 (192.168.2.94): icmp_seq=5 ttl=255 time=119 ms
64 bytes from 192.168.2.94 (192.168.2.94): icmp_seq=6 ttl=255 time=22.0 ms
64 bytes from 192.168.2.94 (192.168.2.94): icmp_seq=7 ttl=255 time=30.4 ms
64 bytes from 192.168.2.94 (192.168.2.94): icmp_seq=8 ttl=255 time=47.7 m
  1. Ethernet
kh@kh-Inspiron-3593:~$ ping portenta-h7-m7-15.local
PING portenta-h7-m7-15.local (192.168.2.87) 56(84) bytes of data.
64 bytes from 192.168.2.87 (192.168.2.87): icmp_seq=1 ttl=255 time=0.964 ms
64 bytes from 192.168.2.87 (192.168.2.87): icmp_seq=2 ttl=255 time=0.216 ms
64 bytes from 192.168.2.87 (192.168.2.87): icmp_seq=3 ttl=255 time=1.07 ms
64 bytes from 192.168.2.87 (192.168.2.87): icmp_seq=4 ttl=255 time=4.40 ms
64 bytes from 192.168.2.87 (192.168.2.87): icmp_seq=5 ttl=255 time=0.314 ms
64 bytes from 192.168.2.87 (192.168.2.87): icmp_seq=6 ttl=255 time=0.635 ms
64 bytes from 192.168.2.87 (192.168.2.87): icmp_seq=7 ttl=255 time=0.996 ms
64 bytes from 192.168.2.87 (192.168.2.87): icmp_seq=8 ttl=255 time=4.47 ms

I suggest you post an issue on ArduinoCore-mbed mbed_portenta core to address the problem.