Internet · 7 min
How to run a reliable Internet speed test and compare results
A useful speed test starts with a specific question.
Read the guide ↗THE JOURNAL / LEARN & ACT
Understand the details.
Improve the whole.
Structured guides, practical steps and context to improve your website.
START HERE
A report changes nothing.
A good decision does.
Learn how to choose a page, read measurements and check the impact of a fix.
Prepare my first audit ↗01 · Observe the right page02 · Identify a priority03 · Fix and compareThe before-and-after protocol ↗
The guide library
These 20 guides are available in French and English.
30 guides available
Internet · 7 min
Mbps, Mbit/s and MB/s: understanding Internet speed units
Before comparing a speed test with a download, check the units.
Read the guide ↗Internet · 8 min
Wi-Fi or Ethernet: finding the source of a slow connection
Compare Wi-Fi and Ethernet by keeping the device, test destination and measurement profile unchanged.
Read the guide ↗Internet · 8 min
Latency and jitter: understanding an inconsistent connection
Latency describes a response delay; jitter describes variation in a sequence of delays according to the measurement method.
Read the guide ↗Internet · 7 min
Packet loss: measuring it without confusing it with HTTP failures
Packet loss and a failed HTTP request are not the same measurement.
Read the guide ↗Internet · 7 min
Testing connection stability for 30 or 60 seconds
A stability test observes repeated responses over time instead of reporting only one throughput result.
Read the guide ↗Internet · 8 min
Loaded latency and bufferbloat: investigating slow responses
Compare response delay when a connection is quiet with delay during download and upload activity.
Read the guide ↗Internet · 7 min
How much Internet speed do you need for reliable 4K streaming?
Streaming quality depends on the platform, content, device and available capacity throughout playback.
Read the guide ↗Internet · 8 min
Diagnosing a connection for video calls and remote work
Describe the call problem before interpreting speed numbers: broken outgoing speech, frozen incoming video, slow screen sharing or delayed conversation are…
Read the guide ↗Internet · 7 min
Gaming ping: investigating lag without blaming the wrong network
Separate network delay from the game's rendering and device performance.
Read the guide ↗Internet · 7 min
Detecting 4G or 5G in a browser: what a website can actually know
A high speed result does not prove that a device is using 5G.
Read the guide ↗Internet · 7 min
VPN speed and latency: comparing performance without losing context
A VPN changes the path and context of a connection.
Read the guide ↗Performance · 7 min
Reading a loading waterfall to find slow resources
A waterfall places network requests on a shared timeline so you can investigate discovery, transfer duration and dependencies.
Read the guide ↗Performance · 7 min
Improving INP: making website interactions more responsive
Investigate the interactions visitors actually perform: opening a menu, submitting a form, selecting a filter or changing a quantity.
Read the guide ↗Performance · 7 min
Improving LCP: loading the main content at the right time
Identify the page's largest relevant content element in the tested context, then investigate document delivery, resource discovery, transfer and rendering.
Read the guide ↗Performance · 7 min
Improving CLS: preventing unexpected page movement
Investigate unexpected layout shifts by watching the loading and interaction sequence, not only the final screenshot.
Read the guide ↗Performance · 7 min
CrUX and Lighthouse: understanding field and laboratory differences
Lighthouse investigates a page under a selected test configuration.
Read the guide ↗Performance · 7 min
Creating a performance budget that prevents regressions
A useful performance budget combines measurable limits, documented test conditions and a response process.
Read the guide ↗SEO · 8 min
SEO, GEO and AEO: making a technical guide useful and understandable
Begin with a real reader's question, give a direct answer, explain its limits and provide verifiable sources.
Read the guide ↗SEO · 8 min
Internal links, external sources and FAQs: organising a useful guide library
Build links around the reader's next decision.
Read the guide ↗Performance · 6 min
A faster website starts with the right priorities.
Before changing hosts, identify what is actually slowing down your page.
Open guide ↗Metrics · 5 min
LCP, CLS, INP: understand your visitor’s experience.
Loading, stability, responsiveness: three different questions.
Open guide ↗Images · 4 min
Lighter images. More room to breathe.
Choose the right dimensions before choosing a format.
Open guide ↗Method · 4 min
Why is your mobile score different?
The same website, two browsing contexts.
Open guide ↗Infrastructure · 5 min
Cache and server: saving time before the first pixel.
Understand server response without blaming everything on hosting.
Open guide ↗Method · 6 min
Your first Lighthouse report, without getting lost.
Turn a list of diagnostics into an action plan.
Open guide ↗Performance · 5 min
JavaScript and third-party services: take back control.
A page can be light to download but expensive to execute.
Open guide ↗Quality · 5 min
A good accessibility score is not the end of the work.
Combine automated checks with a human review.
Open guide ↗Method · 5 min
Before and after: compare without fooling yourself.
A simple protocol to distinguish improvement from variation.
Open guide ↗Method · 4 min
Prepare an audit you can actually use.
Choose the page, scenario and checks that matter.
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