Category: Speed Basics

Learn what the numbers in a speed test mean before using them to diagnose a problem. Download and upload describe data transfer in different directions, while ping and jitter describe aspects of response timing. Units also matter: a rate shown in megabits per second is different from a file size shown in megabytes. These explanations introduce the terms used throughout the site and show why one headline speed cannot describe every application. Start with the measurement you want to understand, then use the relevant troubleshooting or activity guide when you are ready to investigate your connection.

Download speed explained
Upload speed explained
Ping and response time explained
Jitter explained
Mbps and Gbps explained

Do Wi-Fi and Ethernet Combine Their Speeds When Both Are Connected?

Separate ordinary interface preference from bonding, compare Wi-Fi and Ethernet deliberately, and interpret results using the actual network topology.

How Much Data Does a Speed Test Use? Estimate Before You Run It

Use hypothetical data-volume arithmetic and a deliberate run plan to investigate connection speed without overlooking a capped broadband or mobile allowance.

M-Lab Speed Test Privacy: What Measurement Data Becomes Public?

Read the current M-Lab disclosure before running a test and separate public measurement submission from optional website Analytics, advertising and interface choices.

Mac networkQuality Results: What Responsiveness and RPM Mean

Read Apple’s networkQuality results with their method and conditions intact, then compare the measurement with the application problem you actually want to solve.

iCloud Private Relay and Speed Tests: Why Safari Results Can Differ

Interpret Safari throughput with Private Relay state recorded, keep browser and route changes separate, and use a deliberate temporary comparison only when needed.

Why Windows Task Manager and a Speed Test Show Different Numbers

A practical way to read Windows network graphs alongside a speed test, without confusing live traffic, graph scale, peaks or bytes with available internet capacity.

Speed Test Median vs Best Result: Summarize Repeated Runs

Use a worked example and a blank log to summarize repeated speed tests with the median, range, conditions and failed-test outcomes.

The Real Difference Between Low Ping and Stable Ping

Two connections can show the same average ping and feel completely different to play on. Here’s why stability matters more than the number itself.

What Is a DNS Leak and How Does It Affect Your Privacy?

What is a DNS leak? How it bypasses VPN privacy, how to test for leaks, and the fixes including DNS over HTTPS and VPN leak protection settings.

What Is Packet Loss and How to Test It?

Understand packet loss, distinguish application statistics from HTTP failures, and use bounded Windows Ping and PathPing checks without overdiagnosing the result.