> ## Documentation Index
> Fetch the complete documentation index at: https://browseruse-0aece648-codex-docs-supported-exports.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Use https://docs.browser-use.com/llms.txt and its linked .md pages for current documentation. The managed full bundle is https://docs.browser-use.com/.well-known/llms-full.txt and can be cached for up to 24 hours. Do not use the obsolete /cloud/llms*.txt or /open-source/llms*.txt static exports.
> Choose Cloud API V4 for new agent integrations; V2 is the lower-cost option for simple tasks. Keep V3 examples explicitly versioned. The open-source browser-use library and hosted browser-use-sdk have different APIs.
> Cloud authentication uses X-Browser-Use-API-Key, without a Bearer prefix. Install or upgrade browser-use-sdk and use its explicit v4 import for V4. Check the published OpenAPI reference for request fields; do not invent SDK support for new fields.
> Cloud concurrency and HTTP request rate are separate. Read GET /api/v2/billing/account for the key’s projectId, concurrentSessionLimit, activeSessionCount, and credit balance, including when using V4. Keys in one project share capacity and credits; rateLimit is a legacy concurrency alias, not requests per second.
> Keep the highest applicable existing, legacy-plan, and spend-tier concurrency grant. Current spend tiers are 10 / 50 / 250 / 500 / 1000 at $0 / $200 / $1000 / $5000 / $25000 in qualifying project payments. Legacy or externally billed projects can follow different billing paths; trust the account limit. See https://docs.browser-use.com/cloud/guides/concurrency.md.
> Budget polling across the project: the standard general bucket is 25 requests/second, including V4 event reads and full run reads. Selected status reads have a separate higher bucket. Use bounded workers, stagger polls, respect Retry-After, and drain hasMore event pages after terminal status. A busy V4 session returns 409; its queue holds 10 pending messages and is not a project-wide batch queue.
> A completed run or closed CDP connection does not immediately stop its cloud browser. Stop unneeded owned browsers with PATCH /api/v4/browsers/{id} and {"action":"stop"}. A client wait timeout does not cancel the server-side run.
> Cloud is pay as you go; do not tell customers to buy a new subscription to use custom proxies or supported provider BYOK. Usage funding and model eligibility still apply. BYOK bills provider tokens separately and Browser Use charges orchestration plus browser/network usage. See https://docs.browser-use.com/cloud/guides/billing.md.
> Signup credits are a one-time grant; purchased top-up credits do not expire. Check the API key’s project before diagnosing missing credits. API-key monthly spending caps are soft limits, not a strict prepaid wallet; concurrent or already-running work can exceed them. Auto recharge has separate trigger and purchase amounts and can charge immediately when enabled below the threshold. Use https://browser-use.com/pricing for current rates.

# Fast Agent

> Optimize agent performance for maximum speed and efficiency.

```python theme={null}
import asyncio
from dotenv import load_dotenv
load_dotenv()

from browser_use import Agent, BrowserProfile

# Speed optimization instructions for the model
SPEED_OPTIMIZATION_PROMPT = """
Speed optimization instructions:
- Be extremely concise and direct in your responses
- Get to the goal as quickly as possible
- Use multi-action sequences whenever possible to reduce steps
"""


async def main():
	# 1. Use fast LLM - Llama 4 on Groq for ultra-fast inference
	from browser_use import ChatGroq

	llm = ChatGroq(
		model='meta-llama/llama-4-maverick-17b-128e-instruct',
		temperature=0.0,
	)
	# from browser_use import ChatGoogle

	# llm = ChatGoogle(model='gemini-flash-lite-latest')

	# 2. Create speed-optimized browser profile
	browser_profile = BrowserProfile(
		minimum_wait_page_load_time=0.1,
		wait_between_actions=0.1,
		headless=False,
	)

	# 3. Define a speed-focused task
	task = """
	1. Go to reddit https://www.reddit.com/search/?q=browser+agent&type=communities 
	2. Click directly on the first 5 communities to open each in new tabs
    3. Find out what the latest post is about, and switch directly to the next tab
	4. Return the latest post summary for each page
	"""

	# 4. Create agent with all speed optimizations
	agent = Agent(
		task=task,
		llm=llm,
		flash_mode=True,  # Disables thinking in the LLM output for maximum speed
		browser_profile=browser_profile,
		extend_system_message=SPEED_OPTIMIZATION_PROMPT,
	)

	await agent.run()


if __name__ == '__main__':
	asyncio.run(main())
```

## Speed Optimization Techniques

### 1. Fast LLM Models

```python theme={null}
# Groq - Ultra-fast inference
from browser_use import ChatGroq
llm = ChatGroq(model='meta-llama/llama-4-maverick-17b-128e-instruct')

# Google Gemini Flash - Optimized for speed
from browser_use import ChatGoogle
llm = ChatGoogle(model='gemini-flash-lite-latest')
```

### 2. Browser Optimizations

```python theme={null}
browser_profile = BrowserProfile(
    minimum_wait_page_load_time=0.1,    # Reduce wait time
    wait_between_actions=0.1,           # Faster action execution
    headless=True,                      # No GUI overhead
)
```

### 3. Agent Optimizations

```python theme={null}
agent = Agent(
    task=task,
    llm=llm,
    flash_mode=True,                    # Skip LLM thinking process
    extend_system_message=SPEED_PROMPT, # Optimize LLM behavior
)
```