To ensure caching is working effectively:
8.8.8.8 / 8.8.4.4 (Highly reliable routing)
V2Ray, a core component of the Project V platform, is widely used for network proxy and tunneling. While significant attention is given to encryption overhead and routing rules, DNS resolution latency is a critical yet often overlooked bottleneck. This paper details the mechanisms by which a slow DNS server degrades V2Ray performance, analyzes the cascading effects on different routing modes (Dokodemo-door, Socks, HTTP), and provides quantitative benchmarks and mitigation strategies.
The definitive fix is . This architecture routes local domains to local servers and blocked domains to secure, remote servers. v2ray slow dns server
Before changing your settings, confirm that DNS is the actual root cause of your slow V2Ray connection. Check for DNS Leaks and Latency
I can provide a fully customized configuration file tailored to your exact network environment.
V2Ray can route DNS queries through its outbound proxy, but this introduces significant additional latency. Every DNS query must travel to your V2Ray server and back before resolution completes, effectively doubling the round-trip time for each DNS lookup. To ensure caching is working effectively: 8
This format tells V2Ray to use DNS over HTTPS in local mode—the DOH request will not pass through routing or outbound components, reducing latency dramatically. This is particularly effective for users who need fast resolution for domestic domains while using the proxy for international traffic.
When you type a website address, your system must convert that text into an IP address. In a standard network setup, this happens instantly via local internet service providers (ISPs). When using V2Ray, the process becomes complex.
Using IPIfNonMatch prevents unnecessary DNS lookups for clear-cut domain rules, cutting down your time-to-first-byte (TTFB) significantly. Step 4: Clear DNS Caches The definitive fix is
In many environments, especially those with restrictive internet policies, local ISPs inject false DNS responses to block access to specific websites. This is known as DNS pollution. If your DNS queries are leaking outside your secure proxy tunnel, not only are you vulnerable to hijacking, but you're also at the mercy of a potentially slow and censored DNS server. This is a significant problem as it can also compromise your privacy.
Open your V2Ray JSON configuration file (usually config.json ) and update the dns and routing objects using the strategy below.