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CDN industry insights, technical deep-dives and benchmark reports
How to Choose a CDN Speed Test Tool: Check Nodes, Metrics, and Result Records First
How should you choose a CDN speed test service, and how should you read the results? This article covers speed test nodes across mainland China and overseas, along with metrics including DNS, TCP, TLS, TTFB, download speed, P50/P95, and cache hit ratio, and it provides a CDN speed test record sheet and practical testing methods.
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Can Slow DNS Resolution Slow Down a CDN? How to Troubleshoot Domain Resolution Delays
Slow DNS resolution adds to the wait time before a connection to a website can be established. This article shows how to use a browser, dig, and curl to check DNS timing, CNAME chains, TTL, recursive DNS, authoritative DNS, and IPv4/IPv6 issues.
How to Test Cloudflare Speed in China: Results by Region and ISP
How do you test Cloudflare access speed in mainland China? This article shows how to test by city and separately for China Telecom, China Unicom, and China Mobile, and how to interpret the results using the serving data center, TTFB, download speed, cache status, P50, and P95.
How Should You Test CDN Speed When a Website Is Sometimes Fast and Sometimes Slow?
Website performance fluctuating? Here's how to run a CDN speed test the right way. This guide covers testing across multiple regions, ISPs, and time periods, and shows how to pinpoint problems using DNS, TCP, TLS, TTFB, download time, P50, and P95.
How to Check CDN Cache Hits: Understanding HIT, MISS, and Age
What do HIT, MISS, and Age in CDN response headers mean? This article explains cache hits, origin fetches, revalidation, and expired states, and covers consecutive curl tests and common troubleshooting steps.
How to Choose a DDoS-Protected CDN: What to Look for in Protection, Nodes, and Testing Scope
How do you choose a DDoS-protected CDN without relying on marketing figures alone? This article explains the difference between DDoS mitigation bandwidth and business bandwidth, between HTTP flood (CC) attacks and WAF, and how to assess scrubbing nodes, network routes, testing scope, origin protection, and billing rules.
Can a Website Use Multiple CDNs? How to Interpret Results from Multiple CDN Tests
A website can use multiple CDNs simultaneously. This article explains the differences between multi-CDN scheduling, subdomain-based role separation, CDN stacking, and residual configuration left after switching. It also shows how to identify them using DNS, response IPs, and results from multiple regions.
What Is the Difference Between a CDN Node IP and an Origin Server IP?
Explain the differences between CDN node IPs, origin server IPs, and probe node IPs, clarify why a domain lookup typically returns a CDN edge address, and provide website owners with secure methods to verify their own origin servers, logs, and access paths.
Has CDN Acceleration Taken Effect? How to Check After Integration
How do you confirm that a CDN is working after enabling it? From domain resolution, real requests, and cache hits to multi-region speed tests, this guide walks you through checking CDN acceleration step by step, with curl command examples, and explains MISS, HIT, and how to troubleshoot when your website does not show an obvious speed improvement.
CDN Speed Test vs. Website Speed Test: What's the Difference and What Can Each Measure?
Learn the differences between CDN speed testing, HTTP access testing, and full-page loading tests, understand what each type of tool can detect, and how to combine speed test results to troubleshoot slow website access.