Test Real User Experience with Browser Testing

Run real Chrome browsers to validate Core Web Vitals, monitor user journeys, and measure performance metrics that matter to your users.

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Real Browser Testing

Test Like Your Users Do

LoadForge browser testing runs real Chrome browsers powered by Playwright, measuring performance metrics that HTTP requests can't capture—like Largest Contentful Paint, Core Web Vitals, and visual rendering.

Core Web Vitals Monitoring.
Measure LCP, FID, and CLS metrics that directly impact user experience and SEO rankings.
End-to-End User Journeys.
Test complete user workflows—from login to checkout—catching issues before they impact real users.
JavaScript & DOM Interactions.
Test dynamic content, SPAs, and interactive elements that traditional load testing can't reach.
browser_test.py
class LCPUser(PlaywrightUser):
    LCP_THRESHOLD = 1200  # ms

    @task
    @pw
    async def check_lcp(self, page: PageWithRetry):
        cdp = await self.browser_context.new_cdp_session(page)
        await cdp.send('Network.enable')
        await cdp.send('Network.emulateNetworkConditions', {
            'offline': False,
            'downloadThroughput': (1*1024*1024)/8,
            'uploadThroughput':   (1*1024*1024)/8,
            'latency': 50,
        })
        start = time.time()
        async with event(self, "Load home"):
            await page.goto("/")
        await page.wait_for_timeout(1000)
        lcp = await page.evaluate("""
            new Promise(r => {
              new PerformanceObserver(l => r(l.getEntries().at(-1).startTime))
              .observe({type:'largest-contentful-paint', buffered:true});
            })
        """)
        self.environment.events.request.fire(
            request_type="LCP",
            name=f"LCP {'PASS' if lcp<=self.LCP_THRESHOLD else 'FAIL'}",
            start_time=start,
            response_time=lcp,
            response_length=0,
            context={**self.context()},
            url="lcp_metric",
            exception=None if lcp<=self.LCP_THRESHOLD else Exception(f"LCP {lcp:.0f}ms > {self.LCP_THRESHOLD}ms"),
        )

Browser Testing Use Cases

Perfect for UX validation and performance guardrails

Browser testing complements traditional load testing by validating the user experience layer that HTTP requests can't touch.

Performance Regression Testing

Set thresholds for LCP, CLS, and FID to automatically fail deployments that degrade user experience.

Critical Journey Validation

Monitor key user flows like search → product → checkout to ensure they work flawlessly.

JavaScript Performance Testing

Test JavaScript-heavy applications, SPAs, and interactive elements to ensure optimal performance.

Powerful Reporting

Browser Performance Insights

Browser test results integrate seamlessly with LoadForge's reporting platform, providing the same detailed analytics and AI-powered insights you're used to.

Unified Dashboard.
Browser test metrics appear alongside your load testing results in the same familiar interface.
Performance Trends.
Track Core Web Vitals over time to measure performance improvements and catch regressions.
AI-Powered Analysis.
Get automated insights about performance bottlenecks and optimization opportunities from our AI.
Browser Testing Reports

Technical Implementation

Built on Playwright, Powered by LoadForge

Real Chrome Browsers

Each test runs in headless Chrome using Playwright, giving you the same rendering engine your users experience.

✓ Chrome 120.0.6099.71
✓ Playwright 1.40.0
✓ LoadForge Runtime

Familiar Scripting

Write tests using the same Locust patterns you know, with Playwright integration built-in.

from
locust_plugins.users.playwright
import
PlaywrightUser

@task
async def
test_journey
(self, page):
await page.goto("/")

Core Web Vitals

Automatic measurement of LCP, FID, and CLS.

LCP 0.8s
FID 12ms
CLS 0.05

Production Monitoring

Schedule low-frequency checks to monitor UX.

Schedule: Every 15 min
Active

Accessibility Testing

Run Axe accessibility scans for compliance.

Axe Core Integration
0 violations

Perfect Complement

Complete Testing Strategy

Browser testing works alongside LoadForge's traditional load testing to give you comprehensive coverage—from infrastructure limits to user experience quality.

Load + Browser Testing.
Use load testing to validate infrastructure capacity, browser testing to ensure great UX under normal conditions.
Different Scales, Same Platform.
Load tests handle thousands of users, browser tests focus on 5-10 real sessions per generator for deep insights.
Shared Insights.
Both testing methods feed into the same analytics platform for comprehensive performance understanding.
Load vs Browser Testing

Ready to test real user experience?

Browser testing is available on all LoadForge plans. Start validating your user experience today.

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