Do not leave the dns section in your JSON config to chance. Define fast, reliable upstream servers and utilize the hosts mapping for common domains.
geosite:cn alone contains over 80,000 domains. Loading this into memory takes CPU cycles.
If the time between those two logs exceeds 300ms, your DNS server is throttling you.
If your provider supports it, enabling DoH can sometimes be more stable than raw DNS queries.
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.
The Domain Name System is the phonebook of the internet, translating human-friendly domain names (like google.com ) into numerical IP addresses that computers use to communicate. Every time you visit a website, a DNS lookup must occur before any data can be transferred.
When a server is specified as an IP address like "8.8.8.8" , V2Ray queries DNS on UDP port 53 at that address. When "localhost" is specified, V2Ray uses the system's local DNS resolver—but note that outgoing DNS traffic is not controlled by V2Ray in this mode.
many users recommend using 223.5.5.5 (Alibaba) or 114.114.114.114 for domestic domains, combined with encrypted resolvers like 1.1.1.1 for international traffic.
"dns": "servers": [ "127.0.0.1:5353", "1.1.1.1", "8.8.8.8" ]