͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
|
#### Editor’s note
|
|
|
If you search for how people understand and perceive time (and consequently, speed) you’re in for a lot of dense research papers. There are dozens of theories, laws, and effects that influence our time perception.
While in web performance we’re often data-driven, we should also have an understanding of the psychology of speed: when do waits become frustrating? How can we make a long wait more bearable? What are design and communication approaches we can make depending on the length of the wait?
Design and human-interaction led approaches should be deployed side-by-side code-first web performance solutions.
|
|
|
|
|
Karolina
|
|
|
|
|
|
|
|
|
####
What’s Performance newsletter?
|
|
|
|
Performance Newsletter is a
fortnightly mailing by
[Calibre](https://calibreapp.com), featuring web performance
tools, talks and resources.
Don’t worry—we don’t spam. If
you’d like to leave,
[unsubscribe]()
at any time. Suggest content
[here.
](mailto:[email protected])
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# Articles
|
|
|
|
|
|
 |
|
|
|
### [Psychology of speed: a guide to perceived performance](https://calibreapp.com/blog/perceived-performance)
|
|
|
|
[Karolina Szczur ](https://thefox.is)
|
|
Does perceived performance align with what’s reported in monitoring tools? Learn how people perceive speed, when waits become most frustrating and how to avoid a poor user experience.
|
|
|
|
|
|
 |
|
|
|
### [A new technique for image optimization: SVG short circuiting](https://www.zachleat.com/web/svg-short-circuit/)
|
|
|
|
[Zach Leatherman](https://www.zachleat.com/)
|
|
If you are using Eleventy, learn out about a new, experimental build-time image optimisation technique that will shave off some kilobytes!
|
|
|
|
|
|
 |
|
|
|
### [Should AVIF be the dominant image format on the web?](https://tsev.dev/posts/2023-11-10-should-avif-be-the-dominant-image-format/)
|
|
|
|
[Tim Severien](https://tsev.dev/)
|
|
AVIF was supposed to be the image format to use. Check if AVIF images are more accurate, smaller, and whether it’s a better format than JPEG and WebP.
|
|
|
|
|
|
|
|
|
|
|
|
|
# Courses, Talks & Podcasts
|
|
|
|
|
|
 |
|
|
|
### [Challenging assumptions about LCP best practices (with data!)](https://speakerdeck.com/guaca/challenging-assumptions-about-lcp-best-practices-with-data)
|
|
|
|
[Estela Franco](https://estelafranco.com/)
|
|
While LCP seems straightforward to optimise, a large majority of sites fail to serve the critical element fast. Learn where we’re at with LCP, about its subparts and how to track it.
|
|
|
|
|
|
 |
|
|
|
### [CrUX to sea level: lessons in distilling RUM ](https://www.youtube.com/watch?v=9AwStx9wfxA&ab_channel=WebConferencesAmsterdam)
|
|
|
|
[David Ross](https://hachyderm.io/@DRoss)
|
|
Check out how to go from writing SQL queries and aggregating data to telling a successful data-driven performance story.
|
|
|
|
|
|
|
|
|
|
|
# New in Calibre
|
|
|
|
|
|
 |
|
### [Easily investigate page performance with Snapshot Overview](https://calibreapp.com/blog/snapshot-overview)
|
|
We refreshed one of the main performance reports in Calibre to bring attention to Web Vitals assessment, third party and JavaScript impact. Check it out!
|
|
|
|
|
|
|
