browser-use/jev-ultrafast

What it solves

Jev Ultrafast is designed to reduce the latency and overhead associated with browser agents. It eliminates the slow process of sending screenshots to LLMs and replaces it with a dynamic, indexed action space that allows the agent to interact with web pages faster and more efficiently.

How it works

Instead of visual processing, the agent uses a structured element table of the page's DOM. It identifies available operations (such as CLICK, TYPE_TEXT, SELECT, SCROLL) and targets them to specific indexed elements.

To maximize speed, the system uses a single network round trip per decision cycle to determine both the operation and the target. A small LLM is only invoked when text needs to be generated (the TYPE_TEXT operation). The agent also employs several optimization techniques, including atomic DOM snapshots, focus emulation to prevent background throttling, and waiting for useful state changes rather than fixed timers.

Who it’s for

Developers building high-performance browser agents that require rapid execution and minimal API latency.

Highlights

• High-speed execution: Capable of completing complex tasks like Google Flights searches in approximately 7 seconds.
• Reduced overhead: Uses structured state instead of screenshots in the default agent loop.
• One-request decision cycle: Combines operation and target selection into a single request.
• Efficient DOM handling: Reads visible controls and their names atomically to keep context windows small.
• Integrated inspector: Includes a local inspector to visualize numbered elements and operation probabilities.