Desktop: 100/100. Mobile: 91/100. Why this performance gap matters for your SaaS

Hey IH community! 👋

As someone who does technical SEO for SaaS founders, I figured I should practice what I preach and optimize my own site first. The results were... interesting.

The results across devices
Desktop: Perfect 100 performance score
Mobile: 91 performance score

Here's what's interesting
The desktop version is flying - perfect scores across the board with 0.4s First Contentful Paint. But mobile tells a different story with 1.7s FCP, even though it still scores well.

What I learned:
Desktop optimization: 0.4s FCP, 0ms blocking time - nearly instant
Mobile reality: 1.7s FCP shows the real-world mobile experience
Cumulative Layout Shift: 0 (no more annoying page jumps)
Total Blocking Time: 0ms (smooth interactions)

The lesson for founders:
This reminded me why I spend so much time educating clients about vanity metrics. A perfect PageSpeed score on an empty page is worthless. A 91 score on a conversion-optimized site that actually helps your business? That's gold.
Real talk
Working with SaaS founders, I see this all the time - they obsess over tool scores while their actual users are bouncing because of poor UX or slow-loading critical content.

Anyone else experienced this? Where optimizing for users actually hurt your "scores" but improved real metrics?
If you're wrestling with technical SEO stuff and want to chat about what actually moves the needle vs. what just looks good in reports, always happy to share insights. DM me! 🚀
What technical metrics do you focus on for your products?