Browser-use's 'Jev Ultrafast' agent is racking up stars fast — but is it actually fast?
A new open-source browser agent claims a flight search in 7.1 seconds, but the maths behind that number, and the reason for its meteoric GitHub popularity, deserve a second look.
The known bit: a repo with a lot of stars, very fast
Jev Ultrafast is a new open-source project from browser-use, the team behind an existing browser-automation agent product, and it has picked up 9,356 GitHub stars and 582 forks in under a fortnight — numbers you’d normally expect to take months, not days. That growth rate is real and easy to verify on the repository page. What’s less clear is exactly why it’s growing that fast, and whether the software backs up the hype.
What the project actually does
According to the README, Jev is “a browser agent with a dynamic, indexed action space.” In plain terms: rather than getting an AI model to read a full webpage and decide what to click every time, the tool builds a numbered table of interactive elements on the page — buttons, dropdowns, text boxes — and gets the agent to pick from that list. A separate, smaller language model is only invoked to generate actual text when the action involves typing something in. The pitch is that skipping full-page reasoning for most steps makes the whole loop dramatically quicker.
The headline demo backing that up is a claim that the tool booked a one-way flight search from Zürich to London on Google Flights in 7.1 seconds, from a single natural-language instruction, including the time spent waiting for pages to load. That figure comes from browser-use itself, via a linked video and “measurements” page referenced in the README — not from an independent benchmark, and it describes one specific, fairly simple task on one specific website.
So who is actually behind this, and is the buzz organic?
The project sits under the browser-use GitHub organisation, the maker of an established commercial browser-agent product, and the README’s top line is an “important” notice pointing straight to a waitlist for “Browser Use Cloud” — a paid, hosted version of ultrafast browser agents. That context matters: this is not a hobbyist side project going viral by accident, it’s a marketing-adjacent release from a company that already sells adjacent tooling. None of that makes the star count fake, but it does mean the surge is at least partly the product of an existing audience and a coordinated launch, rather than pure grassroots discovery. The repo is licensed MIT and written in Python, and it does contain working code, example scripts and tests — so it isn’t vapourware.
Who this actually affects
If you’re not a developer building browser-automation agents, this changes nothing for you today — there’s no consumer product here, just a code library plus a waitlist for a future cloud service. For developers experimenting with AI agents that operate web browsers, it’s a genuinely interesting architectural idea worth trying against your own tasks, rather than taking the 7.1-second flight-booking demo as a general performance guarantee. Speed on one curated website is not the same as speed, or reliability, across the messy real web.
The takeaway
Jev Ultrafast is a real, actively maintained project with a clever-sounding approach to speeding up browser agents, and its GitHub popularity is genuine in the sense that the stars exist. But the “ultrafast” claim rests on a single self-reported demo from the company promoting a paid product waiting list, not an independent benchmark. Worth watching, not worth taking on faith.