Ever wondered why your business and engagement metrics didn't improve after you sped up your pages? You need correlation charts.

Validate your #webperf & #UX metrics
Identify your site's "performance plateau"
Spot performance-blocking trends on your pages

https://www.speedcurve.com/blog/site-speed-business-correlation/

Slow-loading pages could have 2X more impact on revenue than site outages. Are you at risk of prioritizing one performance issue (downtime) over another equally critical issue (slowness)?

This post covers how to:

Calculate losses due to site slowdowns
Compare those losses to downtime losses
Estimate lost customer lifetime value

https://www.speedcurve.com/blog/downtime-vs-slowtime/

Users will abandon your page if it appears empty and inactive for more than 3 seconds. If they see content rendering or the skeleton of a page loading, you'll buy more time and patience.

Here's how to do it: https://www.speedcurve.com/web-performance-guide/using-critical-css-for-faster-rendering/

The median web page is 8% bigger than it was a year ago. How does this affect your page speed, your Core Web Vitals, your search rank, your business, and most important – your users?

Latest page bloat trends and analysis: https://www.speedcurve.com/blog/page-bloat-2025/

Some key findings:

Median page 8%
Median JS 10%
Median image 5%
Median video 17%

We our customers! Check out these case studies and find out how companies like Pinterest, Trivago, Airbnb, Zillow, BBC, GOV.UK, and The Guardian have used us to monitor their #UX and #webperf, make their sites faster, and improve their business!

https://www.speedcurve.com/customers/

There are so many things I love about SpeedCurve's Vitals dashboard...

Key metrics – Backend, FCP, TBT – alongside Core Web Vitals (because #CoreWebVitals are not enough!)
Defines each metric, including browser support
13 months of data!
Explore INP and LCP subparts
Detailed diagnostics for each metric

Believe it or not, there's more. Sign up (for free) and check it out for yourself: https://www.speedcurve.com/signup/

Let me know if you have any questions or feedback!

Few things frustrate me more than feeling like I've done everything right, but nothing got better.

Say you've done all the right things. You've lazy-loaded and compressed and minified. You've seen improvements to Start Render or LCP or INP. But bounce rate didn't improve. Neither did conversion rate or any other business metric you care about. WHY???

The answer might lie on the performance plateau.

https://www.speedcurve.com/blog/web-performance-plateau/

"I made my pages faster, but my business and user engagement metrics didn't change. WHY???"

https://www.speedcurve.com/blog/web-performance-plateau/

(I just realized my original post about why – and how – to measure the performance plateau for your site was a couple of years old, so I've refreshed it with new info!)

Reminder - PerformanceObserver is tomorrow! Take a break from the news and listen to @ethangardner.com and @verlok.bsky.social talk about #webperf All details and add to calendar at performanceobserver.dev

PerformanceObserver: A virtual...

Real User Monitoring (RUM) lets you see how users experience your site

This @speedcurve snapshot shows how perf impacts UX — only 43% of users were happy!

Better perf = better UX = better results

Are you tracking RUM yet?

After I shared the latest results from SpeedCurve's Industry Page Speed Benchmarks, a number of folks asked me how to create their own competitive benchmarking leaderboards. The good news: you can do that very easily in @speedcurve!

Here's a quick demo: https://support.speedcurve.com/docs/competitive-benchmarking

Why did The Guardian take top spot in our Media Page Speed Benchmarks? Because the main image was the fifth request on the page.

Calling the LCP element early seems like a no-brainer, right? Yet too often, I see it called MUCH too late.

Page Speed Benchmarks: https://app.speedcurve.com/benchmarks/europe/media/slow/largest-contentful-paint/

The Guardian's test details: https://app.speedcurve.com/benchmark/media-eu/test/250409_0T_8f9f8f17b7462666b1e6fe8f04d444c2/?share=freljsuj6913s9s5an29pktz92alec

Yesterday we shared the Media Page Speed Benchmarks for the US, so now we're sharing the latest results for the EU/UK. While it's great to see our friends at The Guardian had an LCP time of just over 2 seconds, unfortunately 12 out of 14 sites failed to meet Google's 2.5 second threshold.

Explore the benchmarks: https://app.speedcurve.com/benchmarks/europe/media/slow/largest-contentful-paint/

This month's performance hero is a person after my own heart – someone who is passionate about building a secure, accessible, performant web for EVERYONE, and who always leads with a deep compassion for users. Let's all join in celebrating Alex Russell (@slightlyoff)!

https://www.speedcurve.com/blog/performance-hero-alex-russell/

Ever struggled to get business folks in your org to care about site speed? This post is for you: https://www.speedcurve.com/blog/site-speed-business-correlation/

Learn how to use correlation charts to:

Connect web performance with business metrics (bounce rate, conversions)
Validate metrics
Spot performance-blocking trends

New to the world of web performance? Welcome! Here's everything you need to get started with website monitoring, analytics, and diagnostics. Learn how to deliver a fast, joyous experience to all your users!

https://www.speedcurve.com/web-performance-guide/

How well do you know common #webperf metrics? Did you know...

INP is only available in RUM and is not supported in Safari?
LCP is not reliable in SPAs?
User Timing is available across all browsers?

Test your knowledge: https://www.speedcurve.com/web-performance-guide/glossary-of-web-performance-metrics/

Behind the scenes of EVERY successful site is a crew of folks who deeply care about UX.

Are you doing everything you can to create a culture of web performance and usability throughout your org? Not only will this lighten your load, it's actually fun!

https://www.speedcurve.com/web-performance-guide/performance-culture-best-practices/

FACT: Business folks at your company DO NOT care about page speed metrics.

But that doesn't mean they don't care about page speed! It means you need to connect it to metrics they DO care about – like conversion rate, revenue, and bounce rate. Here's how to do that.

https://www.speedcurve.com/blog/site-speed-business-correlation/

What if I told you that you can demonstrate the impact of page speed on business KPIs like conversion rate, revenue, cart size, bounce rate, and more... all in one simple chart? Say hello to correlation charts – your new best friend!

Learn more: https://www.speedcurve.com/blog/site-speed-business-correlation/