The paint, the shift, and the rage-click: front-end observability is here!

You care about performance. That’s why you are here with us. You monitor backend bottlenecks, fine-tune APIs, keep databases lean, and automate performance tests. On your dashboards, everything is green.

But you keep hearing the same thing: “It’s still slow.”, from customers and support agents. Your users feel a lag, and you can’t see or predict it. That’s frustrating. And unfair. Is it really just in your user head?

You’re nailing the backend, but still hear “it’s slow”?

It’s 2025. You’re running a decoupled PHP or Python stack, shipping fast iterations, confident in your infrastructure, and you’re back in control of your backend using Blackfire.

However, support tickets continue to flag “slowness.” Your backend logs show no spikes. Your APM says it’s fine. Still, users bounce. Leadership complains. Growth stalls. 

You were looking in the wrong place the whole time

The issue isn’t in your server. It’s in the browser. On a 3G connection in Brazil. Or on an old Android device. Or a flaky CDN from some front-end tool you embed. Or when the layout shifts just before a click.

But you’re blind to it.

You don’t see Web Vitals. You can’t trace user regions. You don’t know how different devices perform. You can’t prove where the problem lies.

You can’t fix what you can’t see

It feels like flying blind. You’re accountable for performance, but can’t prove what’s going wrong. Your gut says it’s frontend. But your tools don’t show it.

Your teammates question your data. A toxic blame game starts to unfold:  Frontend blames Backend, Backend blames Product, Product blames Design. Everyone points fingers, but no one has answers.

And worse: even if you had the data, it would mean cookies, tracking banners, and user consent hurdles you want to avoid. And let’s be honest: Your users probably act the same way you do, they reject unnecessary cookies. That means you’re left with partial information, making decisions on incomplete data.

Privacy-first: observability without surveillance

Blackfire Monitoring and Analytics respects your users’ privacy. We do not track individual users, set cookies, or store personally identifiable information (PII).

That means:

• No cookie banner needed
• Fully GDPR-compliant by default
• No impact on user consent flows

You get actionable insights about how your app is used without compromising user trust or compliance. You are here for actionable performance insights, not for cheap marketing tricks.

Meet the new features: Browser Monitoring and Analytics

Now, you can see what users see! With Blackfire’s new Browser Monitoring and Analytics, you get real-user insights:

• Web Vitals (LCP, CLS, FCP, INP, TTFB) per page, device, and region
• Top pages, referrers, traffic breakdowns, and browser usage
• All 100% GDPR-compliant: no cookies, no banners, no tracking
• And more

Better yet: it’s connected. A slow LCP? Click into the backend trace. One platform. One workflow. You get the Blackfire actionable 360 observability experience.

Take back control: full-stack performance, finally

Now, you know what’s slow. You know where. And you know why.

You fix frontend issues with the same clarity and speed as backend ones. You optimize what really matters: perceived performance.

And you do it without betraying your users’ privacy or adding more dashboards.

Ready to see what users really feel?

If you’re already using Blackfire, front-end observability is on. The features have been added to all existing and new Production plans. You get 1 million front-end traces included in your subscription at no extra cost. How cool is that?

The feature is activated in a single click in your Environments settings. You are one click away from seeing what your users feel.

New to Blackfire? Start crushing performance bottlenecks and get the full-stack picture, from server to screen.

Because performance isn’t just server speed. It’s user experience. And now, you own all of it.

To better observability and beyond