Global Latency Checker
Test your website's performance from 10+ cities worldwide in real-time. Identify bottlenecks and ensure global availability.
Why Geographic Latency Dictates User Conversion and Core Web Vitals
The speed of light in fiber optic cables introduces physical round-trip limits (~5ms per 1,000km). If your origin server resides exclusively in US-East (Virginia), users in Tokyo or Sydney incur at least 150ms–220ms of pure transmission delay for every un-cached TCP handshake and dynamic database request.
1. Distributed Edge Dispatch
Concurrent HTTP GET probes are dispatched simultaneously from North America, Europe, Asia-Pacific, South America, and Africa edge points of presence.
Probing: IAD | FRA | NRT | SYD | GRU | JNB2. Waterfall Timing Breakdown
Each edge node dissects the exact duration spent in DNS Lookup, TCP Connect, TLS Handshake, TTFB (Time to First Byte), and Content Download.
Total = DNS(12ms) + Connect(24ms) + TLS(38ms) + TTFB(45ms)3. Regional Variance & Outlier Scoring
We analyze regional latency standard deviation to highlight whether routing sub-optimality or CDN origin cache misses are penalizing specific continents.
Variance: US (35ms) vs APAC (280ms)Common Reasons for High Regional Latency
CDN Edge Cache Misses (cf-cache-status: DYNAMIC)
Cache MissWhen HTML pages lack public Cache-Control headers, edge CDNs are forced to proxy every request across ocean cables back to your origin server.
DNS Anycast vs GeoDNS Sub-Optimality
DNS RoutingIf your DNS provider lacks global Anycast routing, international users must resolve DNS queries against distant nameservers before initiating a connection.
Transcontinental Database Queries
ArchitectureServerless edge compute functions running in Europe that make 5 sequential queries to a PostgreSQL database located in us-east-1 compound hundreds of milliseconds of delay.
Sub-Optimal BGP Peering and Route Hijacking
ISP PeeringTier 1 ISP congestion or misrouted BGP paths can suddenly route European traffic through North American transit points, quadrupling round-trip time.
Frequently Asked Questions
Everything you need to know about Global Latency Checker and network reliability best practices.
What is an ideal global TTFB target?
For global SaaS and e-commerce websites, an edge TTFB under 100ms for cached assets and under 300ms for dynamic API endpoints is considered world-class.
How can I reduce latency for international users?
Use a global CDN with edge caching (Cloudflare, Fastly), implement read-replica databases close to target markets, and enable TLS 1.3 with 0-RTT session resumption.
Why do latency measurements vary between consecutive tests?
Variables such as cold-start serverless container initialization, BGP route flapping, CDN cache warming, and transient ISP congestion cause minor variations between pings.
How does SteadyStack track global latency over time?
SteadyStack captures response times every minute from over 50 global vantage points, plotting regional latency grids and alerting you if response times spike above your SLA thresholds.
Automate Your Monitoring 24/7 with SteadyStack
Don't wait for manual tests. SteadyStack pings your endpoints from global edge locations every 60 seconds with quorum consensus to eliminate false alarms.