What this test checks
Availability by region
Whether the page loads in each region, with the exact error where it does not: DNS failure, refused connection, timeout, SSL error or redirect loop.
Full load time
Time from navigation start to the load event, measured on a first visit with an empty cache and again on a repeat visit.
Server response (TTFB)
Time from sending the request to the first byte of the response, not counting DNS lookup and connection setup.
DNS and connection time
DNS lookup plus the TCP and TLS handshake in each region, which shows how far visitors are from the server that answers them.
8-region speed grade
An A+ to F grade built from the fastest region, the average of all regions, the slowest region and how many regions load faster on a repeat visit.
US response time
Average server response from US East (Virginia) and US West (Oregon), where Googlebot and most AI crawlers connect from.
CDN and edge cache
Whether a nearby CDN edge server answers in every region, and whether it also serves your HTML from its cache instead of the origin server.
Sample result
A real result for devteam.co.kr, tested 3 hours ago.
Global load speed
Loaded in a real browser from 8 regions worldwide: average load 1.08 s, slowest Frankfurt. From the US, the source of most Googlebot and AI crawler traffic, the server responds in 705 ms. Still needs...
US response time (Google & AI crawlers) (Improve)
Responses are slowish from the US, the source of most Googlebot and AI crawler traffic. Google lowers its crawl rate for sites that respond slowly.
705 ms (East 872 ms · West 537 ms)
CDN & edge cache (Improve)
The CDN connects visitors to a nearby edge server, but the HTML is fetched from the origin server every time. From London, the first response takes 1.4 s.
CDN (HTML from origin)
Availability by region (Good)
The page loaded normally in all 8 regions, so crawlers anywhere in the world can read the site.
8/8 regions OK
Load speed across 8 regions (Good)
Across 8 regions: average server response 622 ms, average full load 1.08 s. Slowest: Frankfurt (1.12 s).
Rated A+ · avg 1.08 s
Full page load by region — first visit and repeat visit
Timing details
| Region | DNS + connect | Server response | Load | Repeat load | Requests |
|---|---|---|---|---|---|
| Seoul ap-northeast-2 | 29 ms | 71 ms | 324 ms | 249 ms | 13 |
| Tokyo ap-northeast-1 | 100 ms | 206 ms | 523 ms | 361 ms | 13 |
| Singapore ap-southeast-1 | 171 ms | 508 ms | 922 ms | 668 ms | 13 |
| Sydney ap-southeast-2 | 431 ms | 557 ms | 1.22 s | 753 ms | 13 |
| US East us-east-1 | 407 ms | 872 ms | 1.54 s | 937 ms | 13 |
| US West us-west-2 | 317 ms | 537 ms | 1.11 s | 531 ms | 13 |
| Frankfurt eu-central-1 | 30 ms | 1.12 s | 1.39 s | 1.3 s | 12 |
| London eu-west-2 | 301 ms | 1.1 s | 1.63 s | 1.36 s | 12 |
Measured with headless Chrome on 8 AWS regions by Global Website Speed Test. Server response = request sent → first byte (excludes DNS/TCP/TLS); load = navigation start → load event.
How it works
- Probe servers in eight AWS regions (Seoul, Tokyo, Singapore, Sydney, US East, US West, Frankfurt and London) load your page in headless Chrome at the same time.
- Each probe opens the page twice, first with an empty cache and then as a repeat visit, and reports navigation timings in milliseconds.
- Regions appear on the page as they answer, and a full run typically takes about 45 seconds.
- A region that cannot load the page within 30 seconds counts as failed, while a probe that is itself offline is left out and does not count against your site.
- The 8-region grade uses the same thresholds as Global Website Speed Test (globalwebsitespeedtest.com), so both tools give the same grade.
How it is scored
The test score uses our item-weighted formula: a pass earns full credit, a warning half and a fail none, with availability, the 8-region grade and US response weighted 3× and the CDN check 2×. The 8-region grade is the best grade whose limits are all met for the fastest region, the average, the slowest region and repeat-visit speed-up; the last three rows show the main limits.
| Check | Good | Needs work | Poor |
|---|---|---|---|
| Regions that load the page | All tested regions | 1 region fails | 2 or more regions fail |
| 8-region speed grade | A+ or A | B or C | D or F |
| US server response (Virginia and Oregon average) | 0.6 s or less | 0.6–1.5 s | Over 1.5 s |
| Slowest region, first response (DNS + connect + server) | 0.8 s or less | 0.8–1.8 s | Over 1.8 s |
| Average full load, all regions | 3.5 s or less (A) | 3.5–5.5 s (B–C) | Over 5.5 s (D–F) |
| Average server response, all regions | 1.2 s or less (A) | 1.2–2.0 s (B–C) | Over 2.0 s (D–F) |
| Regions faster on a repeat visit | 60% or more (A) | 37.5–59% (B–C) | Under 37.5% (D–F) |
Grades: A+ 95–100 · A 90–94 · B 80–89 · C 70–79 · D 60–69 · F below 60.