Posts tagged with
"performance"

Find and fix what matters most

Being able to monitor and measure the performance of your pages is crucial. You know that already. You also know that the next step is to quickly find out what’s hurting your pages so you can stop the pain.

You want to know:

  • Which performance rules is my page breaking?
  • How do I prioritize my optimization efforts?
  • How can I communicate this quickly and clearly to my team?

We’re super excited to announce that you can now use SpeedCurve to answer these questions.

Performance Recommendations

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SpeedCurve RUM: LUX

We're excited to announce SpeedCurve's RUM product, LUX.

The name LUX is a play on "Live User eXperience" and reflects how we've taken a different approach compared to other Real User Monitoring products. SpeedCurve's mission is to help designers and developers create joyous, fast user experiences. To do that, we focus on metrics that do a better job of revealing what the user's experience is really like. 

In addition to standard RUM metrics like page load time and total size, LUX includes innovative new metrics that have more to do with the user experience like start render time, number of critical blocking resources, images above the fold, and viewport size. LUX's RUM metrics help you figure out which design and development improvements will make your users happier and your business more successful.

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Track down front-end CPU hogs

Often when monitoring and debugging site performance we focus on network activity and individual resources, but what about the CPU? As more and more sites switch to using large Javascript frameworks and manipulating the page using Javascript, the execution time this code takes and the available CPU can instead become the performance bottleneck.

CPU usage for all Chrome tests

For any of SpeedCurve's Chrome-based tests, including emulated devices, we capture the Chrome Dev Tools timeline. From the browser main thread usage in the timeline we extract how busy the CPU is and what it's spending time on. Is it busy executing Javascript functions or busy laying out elements and painting pixels?

We also measure the CPU usage to different key events in the rendering of the page. SpeedCurve's focus is on the user experience and getting content in front of people as fast as possible, so we show you what the CPU is doing up till the page starts to render. This reflects CPU usage during the browser critical rendering path and can highlight various issues. If there's lots of CPU idle time then you're not delivering your resources efficiently. You want to get the CPU busy nice and early rendering the page, rather than sitting idle waiting for slow resources.

In the test below we see in the first pie chart that the CPU is spending a lot of time on layout up to the start render event, which is quite a different picture from the Fully Loaded CPU usage.  

CPU pie charts

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Performance budgets in action

Performance budgets are an important tool for ensuring your site is delivering a great user experience. Steve first experienced performance budgets while Head Performance Engineer at Google. The practice of using budgets to track performance took off with Tim Kadlec's blog post Setting a Performance Budget. The idea is to identify your performance goals and track the metrics that help you achieve your goals.

At SpeedCurve, we give performance budgets first-class status by tracking them in the Site dashboard. Here's an example of tracking a budget for image size.

Image performance budgets

Before setting your performance budgets, you first have to be monitoring your user experience. Only then can you set budgets and thresholds for improving your baseline user experience. This also allows you to quantify the improvements you're making and share success stories across the organization like "We just improved start render by 32% by reducing image requests to half the budgeted amount".

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