这种情况是 Github 受到防火墙的影响了吗？

PING github.com (207.97.227.239): 56 data bytes
64 bytes from 207.97.227.239: icmp_seq=0 ttl=48 time=470.561 ms
64 bytes from 207.97.227.239: icmp_seq=1 ttl=48 time=471.941 ms
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
64 bytes from 207.97.227.239: icmp_seq=5 ttl=48 time=472.123 ms
Request timeout for icmp_seq 6
Request timeout for icmp_seq 7
64 bytes from 207.97.227.239: icmp_seq=8 ttl=48 time=472.800 ms
64 bytes from 207.97.227.239: icmp_seq=9 ttl=48 time=472.404 ms
Request timeout for icmp_seq 10
Request timeout for icmp_seq 11
64 bytes from 207.97.227.239: icmp_seq=12 ttl=48 time=472.218 ms
64 bytes from 207.97.227.239: icmp_seq=13 ttl=48 time=471.808 ms

访问 Github 非常缓慢，homebrew 无法进行 update 操作。