Your users don’t care how fast your backend is [video]
You optimized every SQL query. Trimmed milliseconds from every endpoint. And still, your bounce rate is sky-high. Here’s why, in this 3-minute video.
By Thomas di Luccio, on Aug 13, 2025 When backend metrics aren’t enough
You’ve done your job. The backend is blazing fast. Logs are clean. Response times are snappy.
But your users don’t care. Because the page still feels slow.
Here’s the reality: performance isn’t just what happens on the server. It’s what users see and feel in their browser.
Enter: front-end observability
That’s why we built Blackfire’s Front-end Observability features to help you understand how your website actually performs where it matters most: in the hands of real users.
With Blackfire, you can:
- Track real-user performance metrics like TTFB, FCP, LCP, CLS, and INP
- Understand how load times and interactivity vary across countries, browsers, and devices
- Pinpoint front-end issues like JavaScript bloat, layout shifts, and slow CDNs
No guesswork. Just actionable insights.
The performance killers you can’t see from the backend
Backend observability alone won’t reveal:
- A third-party script slowing down your critical path
- A hero image from a misconfigured CDN stalling LCP
- An unexpected layout shift tanking CLS
These problems live on the front end, and they’re often the reason your visitors bounce.
GDPR compliant by design
Best of all? Blackfire’s Front-end Observability works without tracking individuals or requiring consent banners.
We don’t use cookies. We don’t store personal data. You get full visibility without compromising user trust.
Watch and learn
Want to see it in action?
🎥 Watch the video to learn what front-end observability really means, and why it’s essential for delivering fast, user-friendly experiences.
To better observability and beyond
