Fine-tuning your config.json is the most powerful way to optimize DNS.
By default, V2Ray caches up to 65,535 DNS addresses. Old records are discarded based on LRU (Least Recently Used) algorithm. The cache cleanup interval is configurable, with options ranging from every 10 seconds to every 60 seconds.
Whether you are using a
In busy environments with high volumes of DNS traffic, enabling the DNS proxy feature can introduce noticeable latency. When DNS queries go through V2Ray's routing component and exit via a direct outbound, each query incurs processing overhead. In network environments with hundreds of servers and constant DNS lookups, this overhead compounds and becomes a performance bottleneck. v2ray slow dns server
DNS leaks occur when your DNS queries bypass the proxy tunnel and go directly to your local ISP's DNS servers. Beyond privacy concerns, leaks affect speed because:
If the firewall allows, try switching from slowdns to ws+tls (Websocket + TLS) for faster speeds jagu. Conclusion
When setting up a configuration that uses (often referred to as DNS-over-UDP or DNSTT), the "draft text" you need typically refers to the server details generated by a provider or the specific JSON configuration structure. 1. Typical V2Ray Slow DNS Configuration Draft If you are manually drafting a configuration for apps like HTTP Custom , your "text" will follow a structure similar to this: Server Name (Name Server): ://example.com (The subdomain pointing to your server) Public Key: your-generated-public-key-here (Used for encryption) DNS Resolver: (Commonly used upstream resolvers) VMess or VLESS 2. Sample V2Ray JSON (DNS Section) Fine-tuning your config
A Reddit user reported the classic "V2Ray slow DNS server" symptom: curl https://google.com via proxy took 3.2 seconds, but curl https://1.1.1.1 took 120ms.
In the context of V2Ray, the impact of DNS on performance is amplified. V2Ray itself has a built-in DNS server with two main purposes: to resolve a target address for connection and to match routing rules based on the resolved IP of a domain.
Can you share your current from your configuration file? The cache cleanup interval is configurable, with options
What are you trying to bypass restrictions from?
Before reconfiguring anything, confirm that DNS is truly the culprit. Run these diagnostic commands from your client machine:
Editing the basic configuration file is only the first step. To achieve the fastest possible load times, implement these advanced architectural tweaks. Switch to DNS-over-HTTPS (DoH)
When DNS resolution fails or times out for specific domains, parts of a webpage may fail to load entirely. Images, scripts, or stylesheets hosted on slow-resolving domains won't appear, resulting in broken pages. Streaming services may fail selectively or buffer excessively.