我 a.com 是访问用的域名，在阿里云。b.com 是回源用的，在cf。b.com开启了小黄云，并且配置了自定义主机名。然后 a.com 的解析是 cname 到 visa.cn 的。现在使用 itdog 等工具测试看还算可以，但是实际访问有时候就会特别慢，有大佬帮忙看看是什么情况吗？
curl -o /dev/null -s -w "DNS Lookup: %{time_namelookup}s\nConnect: %{time_connect}s\nStart Transfer: %{time_starttransfer}s\nTotal: %{time_total}s\n" https://a.com
DNS Lookup: 0.012655s
Connect: 0.453031s
Start Transfer: 5.715955s
Total: 6.171040s
curl -o /dev/null -s -w "DNS Lookup: %{time_namelookup}s\nConnect: %{time_connect}s\nStart Transfer: %{time_starttransfer}s\nTotal: %{time_total}s\n" https://a.com
DNS Lookup: 0.002214s
Connect: 0.047910s
Start Transfer: 0.410801s
Total: 0.411817s
curl -o /dev/null -s -w "DNS Lookup: %{time_namelookup}s\nConnect: %{time_connect}s\nStart Transfer: %{time_starttransfer}s\nTotal: %{time_total}s\n" https://a.com
DNS Lookup: 0.467783s
Connect: 1.024997s
Start Transfer: 2.370358s
Total: 2.378336s
# 这次等了半分钟都没返回
curl -o /dev/null -s -w "DNS Lookup: %{time_namelookup}s\nConnect: %{time_connect}s\nStart Transfer: %{time_starttransfer}s\nTotal: %{time_total}s\n" https://a.com
^C
curl -o /dev/null -s -w "DNS Lookup: %{time_namelookup}s\nConnect: %{time_connect}s\nStart Transfer: %{time_starttransfer}s\nTotal: %{time_total}s\n" https://a.com
DNS Lookup: 0.003011s
Connect: 0.000000s
Start Transfer: 0.000000s
Total: 131.317540s
主要是怕大佬突然不维护了
我现在就是这种情况，切换网络开关梯子，各种试