jev-ultrafast

jev-ultrafast is an open-source Python browser agent from Browser Use. Instead of asking a model to generate browser instructions, it turns the current page into an indexed table of visible controls and asks Jev to choose from the operations and targets that are valid for that state.

Jev selects an operation and a compatible element in one TypeSafe request. When the selected operation is TYPE_TEXT, a separate small language model generates the field value. The default loop uses structured page state rather than screenshots, and the executor rechecks page freshness, target geometry, and click occlusion before acting.

The public performance figures are author-reported and source-reviewed here, not independently reproduced by WhatCanJevDo. The featured Google Flights recording completes in 7.073 seconds. A matched comparison reports a 7.092-second optimized median versus 9.450 seconds for the original runtime, but the authors explicitly describe it as three repeats of one task on one browser profile—not a broad reliability benchmark.

The current MVP handles common HTML and ARIA controls. The project documentation lists shadow roots, frames, canvas, uploads, pop-up tabs, nested scrolling, and arbitrary keyboard widgets as unsupported. A DONE choice still needs independent outcome verification.