#### article
## How changes to Lighthouse impact your positioning
This year, Chrome Developer Summit has seen a handful of crucial performance announcements. Most importantly, to our performance and marketing efforts, the Lighthouse scoring algorithm will change significantly, and Chrome will start visually marking slow sites in their UI.
[]()[Chrome Developer Summit 2019: performance announcements you have to know →](https://calibreapp.com/blog/performance-at-chrome-dev-summit)
#### article
## Understand the state of performance in 2019
In his in-depth research, [Rick Viscomi](https://twitter.com/rick_viscomi) walks us through fascinating findings in Chrome UX Report. For example, it turns out that very few sites have fast Time to First Byte, and only 13% of sites are considered fast based on First Contentful Paint. We have lots of work to do.
[]()[Web almanac: The state of performance →](https://almanac.httparchive.org/en/2019/performance)
#### case study
## How Instagram decreased their bundle size by 6%
In the fourth article in the performance series, [Glenn Conner](https://twitter.com/mr_sharpoblunto) describes how Instagram significantly reduced the amount of shipped JavaScript, thus speeding up code execution on the main thread.
[]()[Making instagram.com faster: Code size and execution optimizations →](https://instagram-engineering.com/making-instagram-com-faster-code-size-and-execution-optimizations-part-4-57668be796a8)
#### article
## Learn about crucial performance metrics
[Phil Walton](https://twitter.com/philwalton) and [Milica Mihajlija](https://twitter.com/bibydigital) authored a series of guides to most essential performance metrics. They concentrate on the new generation of metrics serving the goal of accurately portraying user experience such as Largest Contentful Paint, First Input Delay, Total Blocking Time and Cumulative Layout Shift.
[]()[performance metrics →](https://web.dev/metrics/)
#### tools
## Render YouTube embeds fast
An interesting experiment from [Paul Irish](https://twitter.com/paul_irish), showcasing that embedding a YouTube video doesn’t necessarily have to result in a sluggish UX. A custom **lite-youtube** element is able to render videos perceivably faster.
[]()[lite youtube embed →](https://github.com/paulirish/lite-youtube-embed)
#### new in calibre
## What Calibre released last month
📚**Release Notes: October**
Here’s our monthly roundup of what was released in October: [Largest Contentful Paint](https://calibreapp.com/docs/metrics/largest-contentful-paint) support, reordering pages, Lighthouse 5.6 and more.
🆕**Website and documentation**
We’ve spent the last few months reimagining Calibre’s brand and content. We described not only the performance monitoring platform but also [crucial performance concepts such as metrics](https://calibreapp.com/docs/metrics/overview) and Lighthouse scoring. Have a read, whether you’re a Calibre user or not.
[]()
