Running an Accurate Internet Speed Test: Getting Reliable Results
Speed tests are the primary tool consumers use to verify their internet service. But a speed test only tells you something useful if it is conducted properly. Improperly run speed tests frequently produce misleading results that can cause you to blame your ISP for problems caused by your home network, or miss genuine ISP performance issues masked by testing under ideal conditions.
### Pre-Test Preparation
**Close other applications**: Before testing, close all applications on your testing device that might consume bandwidth. Web browsers with many open tabs, cloud sync services, streaming apps, and automatic updaters all consume bandwidth that reduces your speed test result.
**Pause other devices**: If possible, pause or disconnect other devices on your network during the test. Other devices streaming, downloading updates, or syncing cloud data compete for bandwidth and reduce your test result. This step is especially important on cable connections where upload bandwidth is limited.
**Use a wired connection first**: For the most accurate measurement of your internet connection speed (rather than your WiFi speed), connect your device directly to your router or ONT via an ethernet cable. This eliminates WiFi as a variable.
**Verify your ethernet cable**: If testing wired, ensure your ethernet cable supports your plan's speed. Cat 5e supports up to 1 Gbps. Cat 6 or higher is needed for multi-gig plans. An old Cat 5 cable limits you to 100 Mbps regardless of your actual plan speed.
### Choosing a Speed Test Tool
Different speed test tools can produce different results due to server location, test methodology, and measurement approach. For the most reliable assessment, test with multiple tools:
**FiberFinder Speed Test**: Our [speed test tool](/speed-test) measures download, upload, latency, and jitter while contributing to our community performance database.
**Ookla Speedtest (speedtest.net)**: The most widely used consumer speed test. Choose a server geographically close to you for the most representative result.
**M-Lab NDT**: An open-source alternative that measures additional network health metrics beyond simple speed.
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Check My Address**Fast.com**: Netflix's speed test, useful specifically for measuring throughput to Netflix servers.
If results vary significantly between tools, the differences typically reflect server proximity and capacity rather than your actual connection speed. Your ISP is generally responsible for delivering speed to their network edge, not to every server on the internet.
### Running the Test
**Test at multiple times**: A single speed test is a snapshot of one moment. Test at different times throughout the day to understand your connection's consistency: - Early morning (6-8 AM) - Midday (12-2 PM) - Early evening (5-7 PM) - Peak evening (8-10 PM)
**Run multiple tests per session**: Run the speed test 3 to 5 times and note the average. Individual tests can vary due to momentary network conditions.
**Record your results**: Keep a log of your speed test results with dates and times. This historical data is invaluable for identifying trends and supporting complaints to your ISP if service degrades.
### Interpreting Results
**Download speed**: Should be at least 80% of your plan's advertised speed on a wired connection. Fiber plans typically deliver 90-98% of advertised speed. Cable plans commonly deliver 70-90%.
**Upload speed**: Compare against your plan's stated upload speed. For fiber, upload should be similar to download. For cable, expect the (much lower) upload speed listed in your plan details.
**Latency (ping)**: Lower is better. Fiber connections typically show 1-10ms to nearby servers. Cable shows 15-40ms. Anything above 50ms for a wired connection suggests a network issue.
**Jitter**: Measures latency variation. Under 5ms is good. Jitter above 15ms can affect video calls and gaming.
### WiFi Speed Test Interpretation
If testing over WiFi, expect lower speeds than wired. The difference between wired and WiFi results tells you about your WiFi setup quality:
- WiFi result within 80% of wired result: Good WiFi setup - WiFi result 50-80% of wired: Room for WiFi optimization - WiFi result below 50% of wired: WiFi is a significant bottleneck, upgrade equipment or improve placement
### When to Contact Your ISP
Contact your ISP if: - Wired speed tests consistently show less than 70% of your plan's advertised speed - Speeds have degraded significantly compared to your historical baseline - Latency has increased noticeably from previous measurements - You experience frequent disconnections or speed drops to near zero
Provide your speed test log data when contacting your ISP. Concrete data strengthens your case compared to vague complaints about slow internet.
**Start testing your connection today.** [Run a speed test on FiberFinder](/speed-test) and build your performance history.