V2ray Slow Dns Server Review

If no explicit DNS config is provided, V2Ray defaults to the system’s DNS resolver (via Go’s net.Resolver). This is often slow due to:

SSH into your V2Ray server and run:

time nslookup google.com 8.8.8.8

Look at the real time. If it is above 100ms, you have a problem. v2ray slow dns server

If you still see slowness:

If domain resolution is slow, switch to IP-based routing rules and rely on SNI sniffing. If no explicit DNS config is provided, V2Ray

queryStrategy controls whether V2Ray queries IPv4, IPv6, or both. If you request both (UseIP), but your IPv6 path is broken, the resolver will wait for an IPv6 timeout (~5–10 seconds) before falling back to IPv4.

Why slowness happens: A single misconfigured or high-latency upstream DNS server blocks the entire resolution pipeline. Look at the real time

Slow DNS server = DNS lookups used by V2Ray (system resolver, DNS proxy, or remote DNS) are taking too long or timing out, causing slow initial connections, hanging websites, or high latency for apps behind V2Ray.

The simplest solution is to switch to a faster and more reliable DNS server. Public DNS services like Google's DNS (8.8.8.8, 8.8.4.4) or Cloudflare's DNS (1.1.1.1, 1.0.0.1) are popular choices for their speed and reliability.