V2ray | Slow Dns Server

Apply these fixes in order of impact.

Using default DNS like 8.8.8.8 from a country far away (or blocked/throttled by ISPs) adds 150–300ms per query.

If you're using V2RayN (a client for Windows), you can:

Instead of relying on public resolvers, run a local DNS cache on your VPS using dnsmasq or unbound. This reduces latency to near zero after the first query. v2ray slow dns server

Step 1: Install Dnsmasq

apt install dnsmasq -y

Step 2: Configure Dnsmasq (/etc/dnsmasq.conf)

port=5353
listen-address=127.0.0.1
cache-size=10000
server=1.1.1.1
server=8.8.8.8

Step 3: Point V2Ray to Localhost In your V2Ray config: Apply these fixes in order of impact

"dns": 
  "servers": [
    "127.0.0.1:5353",
    "1.1.1.1",
    "8.8.8.8"
  ]

Why this works: The first query to google.com hits 127.0.0.1:5353. Dnsmasq fetches it (slow once), caches it. Subsequent queries take ~1ms.

Introduction

V2Ray is a powerful platform for building proxies and bypassing network restrictions. However, a common frustration among users is painfully slow DNS resolution. You might find that web pages hang for seconds before loading, or that streaming services buffer endlessly, even when your proxy throughput is high. Step 2: Configure Dnsmasq ( /etc/dnsmasq

The root cause is rarely the V2Ray core itself. Instead, it is typically a misconfiguration of the DNS module or an incompatibility between V2Ray’s routing and your upstream DNS server.

This article provides a full breakdown of why DNS becomes slow in V2Ray, how to diagnose the exact bottleneck, and step-by-step solutions to optimize your setup.