Jev Ultrafast, an open source browser agent built on the Jev decision framework, bills itself as the fastest and cheapest web agent available, according to its GitHub repository. The project has drawn more than 21,000 stars since it was created in September.
The agent picks an action and its target in a single API call, reading the page through atomic DOM snapshots rather than screenshots, and generates text only when a step requires typing into a field, the repository states. A speculative step poses candidate next actions before the page finishes loading, keeping only the ones that turn out to match an actual element.
In its own benchmark, a Google Flights search dropped from a median 9.45 seconds to 7.09 seconds, a 25% reduction, while the number of browser protocol calls needed fell from 1,092 to 101 across repeated runs, according to the repository. The project is released under the MIT license, with a Python implementation.
The bottleneck in most browser agents is round trips: screenshot, model call, action, repeat. Cutting that to one request per decision is an architecture change rather than a prompt tweak, and it is open for anyone to fork, test against their own workload, and verify the numbers themselves.