The site will generate a "Slow DNS Config" text block containing your NS (Name Server) Public Key 4. Application-Specific Drafts HTTP Custom: You often import a
To get started, you need to create a server account that specifically supports "Slow DNS."
: If your V2Ray configuration sends domestic website requests to an overseas DNS server, you will experience unnecessary latency. Step 1: Diagnose Your DNS Speed
This guide provides a basic setup. V2Ray offers extensive customization options and supports various transport protocols, encryption methods, and more. For advanced configurations, refer to the official V2Ray documentation . v2ray slow dns server
Traditional DNS uses UDP, which can be easily hijacked, dropped, or throttled by Internet Service Providers (ISPs). Switching to DoH encrypts your DNS queries inside standard HTTPS traffic, preventing throttling.
Run these commands from your V2Ray client machine to test DNS performance directly:
In TUN mode, a client might try to resolve the proxy server's address through the tunnel before it's fully established, causing a loop. The site will generate a "Slow DNS Config"
"domain": ["full:google.com", "full:youtube.com", "keyword:netflix"]
The primary reason DNS causes slowness in V2Ray is the "double-hop" latency. In a typical setup, a DNS query must be sent through the proxy tunnel, resolved by a remote server, and then sent back. If the DNS server is geographically distant from the V2Ray outbound node, the round-trip time increases exponentially. Furthermore, if the V2Ray configuration forces all DNS traffic through a single, congested public resolver like 8.8.8.8 without considering the user's location, the "Time to First Byte" for every website will be noticeably high. This creates a bottleneck where the proxy is fast, but the "handshake" required to find the destination is slow.
After applying these changes, verify your DNS performance has improved: Switching to DoH encrypts your DNS queries inside
What (Windows, Android, iOS, Linux) are you running?
What are you using (e.g., v2rayN, v2rayNG, Clash, Nekoray)? What operating system is your client running on?
Internet speed tests show most lag and failed page loads don't come from your proxy throughput—they come from DNS timeouts and slow lookups. If your V2Ray connection is hanging on "resolving host" or pages take seconds to start loading, you're dealing with a DNS bottleneck. This guide walks through why DNS slows down in V2Ray, how to diagnose the exact cause, and proven fixes that work in real-world deployments.