Pulse Test Reveals Evening Broadband Lag Issues

BroadbandSwitch.uk has relaunched its free Pulse speed test to measure lag during evening broadband slowdowns, a phenomenon that has been a source of frustration for many internet users. The relaunch comes as the company seeks to address the issue of lag, which can significantly impact online activities such as video calls and gaming, especially during peak usage times.

The Pulse test, which runs in the browser against Cloudflare's public speed endpoint, measures four key aspects: download speed, lag when the line is quiet, lag when the line is full, and how steady that lag is. The test, which takes about thirty seconds to complete, does not measure upload speeds. The results are displayed on a single screen, replacing the old composite Pulse Score, and include plain English explanations for technical terms such as idle latency (ping) and bufferbloat.

The company's latest test reveals that the speed of the line barely changes between 8 pm and 10 pm, but the time it takes for quick requests to be processed behind the heavy traffic already on the line significantly increases. For example, a video call and a 4K stream, a game download, and a backup running simultaneously can cause a lag of 14 milliseconds when the line is quiet, climbing to 68 milliseconds when the line is full. This lag, known as bufferbloat, can severely impact real-time activities such as video calling and online gaming.

Ofcom's most recent home broadband performance report, published on September 14, 2023, shows that the average download speed between 8 pm and 10 pm was 67.7 Mbps, representing a 95% drop from the average maximum speed of 71.0 Mbps. This significant drop in speed is not due to a decrease in overall speed but rather to the increase in lag, which can be attributed to the growing number of simultaneous online activities, such as streaming and gaming, during peak usage times.

Full fibre lines, which have the lowest latency of any technology, measured by Ofcom, had an average latency of 4.9 to 7.3 milliseconds, compared to around 24 milliseconds for ADSL, the oldest copper lines. The average UK home broadband connection used 583 GB of data in July 2025, up 10% from a year earlier. Ofcom's guidance suggests that most online activities need a response in under 100 milliseconds, and some online games in under 50 milliseconds. If a line's speed falls below the minimum guaranteed speed in the contract and the provider cannot fix it within 30 calendar days, customers may be able to leave without penalty.

BroadbandSwitch.uk's Pulse test also includes a feature that compares the performance of the line and Wi-Fi. After the first result, the router check runs a short second download a meter from the router, either by cable or on the 5 GHz band, and sets the two side by side. A big jump in performance indicates that the Wi-Fi is the bottleneck, while about the same means the line is the limit and a faster package is the fix. Ofcom's own placement advice applies to the first case, recommending that the router be kept out in the open, off the floor, and roughly central in the home.

Pulse also asks three key questions: is it the Wi-Fi, are you getting what you pay for, and could you do better? The results are displayed on a single screen, with the download number, one verdict sentence, and three traffic lights: download, lag, and when busy. The grades, the two lag bars, and two quick sums are displayed under "More detail," along with the share of the advertised speed the line delivers and the cost of each megabit on the bill. The results are not stored, and nothing leaves the browser.

BroadbandSwitch.uk's founder, Dr. Alex J. Martin-Smith, founded Pulse to provide a test that gives the technical terms plain English names with the technical ones alongside. The company's goal is to help customers understand their broadband performance and make informed decisions about their internet service. The company's compensation calculator works out what is owed if a provider is in Ofcom's automatic compensation scheme, and customers can go to the Communications Ombudsman or CISAS for free after six weeks if a complaint is not settled.

The company's latest test reveals that the lag behind evening slowdowns is not a drop in speed but a significant increase in lag, which can be attributed to the growing number of simultaneous online activities, such as streaming and gaming, during peak usage times. The test also includes a feature that compares the performance of the line and Wi-Fi, and asks three key questions to help customers understand their broadband performance and make informed decisions. The results are not stored, and nothing leaves the browser. BroadbandSwitch.uk's goal is to help customers understand their broadband performance and make informed decisions about their internet service.