Why Distance Matters
A speed test measures how fast your connection can fill a single TCP stream between your device and a server. Two things get worse as that server gets farther away:
- Latency grows with distance — every 1000 km of physical distance adds roughly 10 ms round-trip even over fiber
- Packet loss grows because more routers and links are in the path, each a chance for congestion or errors
TCP is latency-sensitive: its throughput drops as round-trip time (RTT) and packet loss rise. Doubling the latency to a server can easily halve achievable single-stream throughput, even though your actual plan capacity hasn't changed.
What Changes When You Switch Servers
| Your connection | Server distance | Typical result |
|---|---|---|
| 1 Gbps fiber | Same city (5-50 km) | 900-980 Mbps, 1-5 ms ping |
| 1 Gbps fiber | Same country (500-3000 km) | 700-900 Mbps, 20-50 ms ping |
| 1 Gbps fiber | Different continent | 200-500 Mbps, 100-200 ms ping |
| 100 Mbps cable | Same city | 95-100 Mbps |
| 100 Mbps cable | Same country | 85-95 Mbps |
| 100 Mbps cable | Different continent | 50-80 Mbps |
Lower-tier plans are less affected because their capacity ceiling is below the latency penalty — a 100 Mbps plan can still fill a trans-continental link, while a 1 Gbps plan cannot.
Which Server to Pick For Which Question
| Question | Pick this server |
|---|---|
| Is my ISP delivering the plan I pay for? | Nearest server (same city) |
| How fast are my downloads from US sites? | Your region (same country) |
| How fast are my gaming matches? | The game's matchmaking region |
| How fast is my VPN to its server location? | Same city as your VPN exit node |
| How fast is a specific website? | No speed test can answer this — use curl or the browser devtools |
Why Speed Test Sites Default to the Closest Server
A few reasons:
- It measures your ISP's capacity with minimal outside variables — the "best case" for your plan
- It's the speed most people get for streaming, since CDNs like Netflix and YouTube serve from nearby edge caches
- Distant-server results would look bad for the speed test provider, since users blame the tool, not geography
This is why Ookla, Fast.com, Cloudflare speed test, and SpeedTestHQ all default to the nearest server with good capacity. It is the most flattering measurement for your connection, and it matches how most content actually reaches you.
Real-World Use Cases Where Distant Is the Right Test
- Comparing ISPs for someone with global traffic — international stock traders, developers pulling from distant repos, anyone whose work servers are not in the US
- Checking Starlink routing — Starlink often routes through ground stations in unexpected regions
- Validating a VPN — test to a server in your VPN's exit country
- Gaming to specific regions — match server for your most-played game
How to Verify a Server Is Honest
Not all speed test servers are equal. A server with under-provisioned upstream will cap your results even if your connection is faster. Quick check:
- Run the test 3 times to the default server, note the average
- Pick a different server in the same city or region, run 3 more tests
- If both average to the same number, you're likely at your real connection cap
- If one is consistently much lower, that server is under-provisioned — not your connection
Why Your Results Change Even With the Same Server
Server location is one variable. Others that change your results:
- Time of day — cable networks congest in the evening (see mornings vs nights)
- Wi-Fi vs wired — Wi-Fi routinely delivers 40-80% of wired
- Browser and other tabs — cached tabs eating bandwidth skew results
- Other devices — any active cloud backup or stream on your network
Frequently Asked Questions
Should I pick the nearest speed test server?
Yes, for measuring your ISP's delivered capacity. Nearby servers minimize latency and routing variables, giving you the cleanest measurement of your plan's actual speed.
Why is my speed lower to a distant server?
Latency reduces single-stream TCP throughput. Every 1000 km adds roughly 10 ms round-trip; at ~100 ms RTT, a single TCP stream can't fill a gigabit pipe regardless of your plan speed.
Is the server location affecting my Netflix or YouTube speeds?
Usually no. Major streaming services use CDNs that serve from the edge closest to you. Your speed test to a nearby server is a better proxy for streaming than a test to a distant one.