V2ray Slow | Dns Server

When V2Ray's built-in DNS caching is disabled or ineffective, the same domain gets resolved repeatedly, increasing DNS query volume and wasting bandwidth. V2Ray's DNS cache is enabled by default with a 10-minute TTL (Time to Live), but misconfiguration can disable this feature. Without proper caching, each visit to a website triggers a fresh DNS lookup, which is inefficient.

dig @1.1.1.1 google.com +tcp +timeout=2

Another critical factor is DNS poisoning and interference. In restricted network environments, ISPs often hijack or throttle standard DNS queries. If V2Ray is not configured to use encrypted protocols like DNS-over-HTTPS (DoH) or DNS-over-TLS (DoT), the local network may interfere with the resolution process, leading to timeouts or redirected traffic. This struggle between the local censorship and the proxy's attempt to find a clean path often results in "hanging" connections, where a page takes several seconds to begin loading.

Replace standard IP addresses in your V2Ray DNS server list with secure URLs: v2ray slow dns server

As highlighted in Catchpoint's analysis of slow DNS , geographical distance is a primary factor in latency. If your Slow DNS server is in Asia and you are in Europe, the round-trip time (RTT) will be high. Choose a server located closer to your ISP's backbone.

If your V2Ray connection feels unusually slow even for a DNS tunnel, check these configuration points:

This indicates a deadlock where V2Ray cannot reach its upstream DNS servers. The most common cause is the DNS request loop in TUN mode. The solution involves either simplifying DNS configuration to bypass V2Ray processing or creating specific routing rules to exempt DNS traffic from being captured. When V2Ray's built-in DNS caching is disabled or

"type": "field", "port": "53", "network": "udp", "outboundTag": "direct"

DNS resolution dropped to 8ms (cached) to 45ms (uncached). Total page load dropped to 400ms.

To get started, you need to create a server account that specifically supports "Slow DNS." dig @1

v2ray -config config.json | grep "DNS lookup"

Run these commands from your V2Ray client machine to test DNS performance directly:

270ms + download time.