Let's check first.
Then we'll fix it.
A specific problem, a short plan and a working test are right in the article.
Internet keeps disconnecting for a few seconds
Step-by-step check of short breaks: connection log, comparison of Wi-Fi and cable, ready-made list of data for provider support.
Figure it outFast internet but games still lag: test latency under load
Why fast Internet may lag in the game. Check boot latency, cable comparison, and next steps without buying a new plan.
Figure it outWi-Fi slows down in the evening: router, interference or ISP?
Compare evening and daytime measurements, cable and Wi-Fi. A practical plan to help narrow down the cause without accidentally changing settings.
Figure it outHow to test packet loss and distinguish it from high ping
What the browser loss test shows, how to read transmission directions and what to do if WebRTC does not connect at all.
Figure it outMouse double-clicking on a single click
Test the fast repeat clicks, separate the system settings from the button failure, and repeat the test on a different connection.
Figure it outMouse scroll wheel jumping or scrolling backwards
Checking reverse scrolling and wheel direction changes. How to separate device events from individual site behavior.
Figure it outKeyboard typing double letters
Checking for repeated key events without writing the entered text to the server. How to distinguish a hold from quick repetitions after releasing.
Figure it outKeyboard misses simultaneous keys: ghosting and rollover
Rollover test for games. How to reproduce a specific combination and not confuse a keyboard limitation with a browser hotkey.
Figure it outController stick moves on its own: drift and dead zone tests
Look at the original axes of the gamepad, compare the center before and after the movement, and understand the role of the dead zone without a universal defect rate.
Figure it outMicrophone background noise
Local microphone test with dBFS indicator and recording. How to compare silence and speech and find the cause of noise in an application.
Figure it outHow to check CGNAT and your router’s WAN IP address
Compare the external address with the WAN IPv4 of the router. Understand private ranges, 100.64.0.0/10, double NAT, and browser inspection restrictions.
Figure it outDead pixel or dust? Inspect your screen with solid colors
How to inspect the screen on white, black and colored fields, distinguish a stable point from contamination and prepare a call for service.
Figure it outWebcam not working in your browser: permissions and device selection
Test your webcam locally and troubleshoot access denial, busy device, and incorrect camera selection without sending video to the server.
Figure it outOne headphone not working? Check left and right channels
Compare left and right channels, system balance and mono mode. The test starts from a low level and stops automatically.
Figure it outHow to test your connection before a video call
A short plan before the call: camera and sound, stability, load and backup connection method. All checks are available from the article.
Figure it out144 Hz monitor but the browser shows 60: what to check
Measure the tab's frame rate, compare it to your display settings, and understand browser, cable, and power-saving limitations.
Figure it outAudio and video out of sync
A flash and a short sound will help you compare synchronization in the browser. Checking Bluetooth, wired output and player settings without recording a microphone.
Figure it outVocals disappear in mono
Compare stereo and mono, look for areas of mutual cancellation and an empty channel. Analysis of a short audio file works locally, without sending the recording to the server.
Figure it outBlurry text on a TV connected by HDMI
Compare color and black-and-white single-pixel stripes. Step-by-step check of scale, PC mode and color detail when connecting the TV to a computer.
Figure it outVPN slowing your internet? Compare two connections
Measure the speed through the VPN and the basic connection in one tab, understand what the percentages, latency and limitations of the selected node mean.
Figure it outVPN shows the wrong country: check your visible IP
Check the country of visible IP and compare the addresses. Why the geolocation database, browser and VPN application can show different countries.
Figure it outWebRTC shows a different IP: what does it mean?
Compare HTTP IP vs. WebRTC candidates right in the article. Understand local addresses, mDNS, IPv6, and the blank test result.
Figure it outHow much mobile data does a video call use?
Calculator mobile data consumption by bitrate and time. Calculate gigabytes of calls and compare the forecast with the actual consumption.
Figure it out