DNS Resolution Latency
DNS resolution latency is the time a client spends resolving a hostname to an IP address before any TCP or TLS connection can start. Slow or distant resolvers, cache misses, and long CNAME chains add tens to hundreds of milliseconds to the first request a user makes to a new API host.
Technical Architecture & Deep-Dive
Every new API domain passes through DNS unless the answer is cached locally. Mobile OS resolvers, corporate DNS filters, and multi-step CNAME indirection each add hops. That delay sits before TTFB and is easy to overlook when profiling only server logs.
Using a stable custom domain on an edge provider with fast anycast DNS reduces lookup variance. Long TTLs on non-critical records help resolvers cache answers, while keeping API traffic on one hostname avoids repeated lookups across many third-party subdomains. For first-party gateways, DNS performance is part of the mobile experience.
Key Architectural Benefits
Implement DNS Resolution Latency at the Edge
Deploy lightweight API aggregation, edge caching, and secret injection in minutes without Docker containers or complex servers.
Frequently Asked Questions
Q:Does HTTP/3 remove DNS latency?
No. Clients still resolve the hostname first. QUIC reduces connection setup after DNS, but lookup time remains unless answers are cached.
Related Architecture Concepts
Custom Domain Edge Routing allows developers to map their own branded domain (e.g., api.yourdomain.com) to edge infrastructure via CNAME and automated TLS issuance. This creates white-labeled API endpoints, prevents third-party ad-blocker filtering, and enhances brand authority.
A Content Delivery Network (CDN) is a globally distributed network of servers that caches and serves content from locations close to users. By answering requests from a nearby point of presence instead of a distant origin, a CDN reduces latency, offloads origin traffic, and absorbs traffic spikes.
Round trip time (RTT) is the duration for a network packet to travel from a client to a server and back. Every sequential HTTP request pays at least one RTT before data arrives, and TLS setup adds more round trips, so chatty APIs on mobile networks feel slow even when server processing is fast.
Edge computing runs application logic on servers distributed close to users instead of only in a central cloud region. For APIs, that means authentication, caching, aggregation, and response shaping execute in a nearby point of presence, so clients avoid long network paths to a single distant origin on every request.
Ready-to-Use Edge Recipes
To solve edge caching reverse proxy for rest apis, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.
To solve sub 10ms api response time for mobile apps, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.