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1 August 2023

⚡ 132: How bfcache improves conversion

͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
 
Performance Newsletter
[issue 132]()
 
#### Editor’s note
 
Do you ever feel like you are not doing enough? I know, quite an existential question for a web performance newsletter, but it’s something I think quite a bit about. Especially in the context of the complexities of web performance and as someone who runs a small (4 people!) but ambitious company that focuses on that work. It’s a lot.
 
Jeffrey’s talk (mentioned in this issue) touches on the feelings of overwhelm, prioritisation battles and states in its title “We’re all doing the best we can”. And while that thesis has friction—it offers comfort at best, and at worst, an excuse, it’s helpful to think of it as a description of a state of flux. You might have released a small improvement today, but small improvements matter, over time. A good thing to remember.
 
Karolina
 
 
 
 
#### What’s Performance newsletter?
 

Performance Newsletter is a fortnightly mailing by [Calibre](https://calibreapp.com), featuring web performance tools, talks and resources.

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# Articles  
 
Screenshot of Pagespeed Insights report showcasing that it's gathered based on real user data
 
### [Core Web Vitals for search engine optimisation: what do we need to know?](https://csswizardry.com/2023/07/core-web-vitals-for-search-engine-optimisation/)
 
[Harry Roberts](https://csswizardry.com/)
There’s a lot of focus on improving Core Web Vitals specifically to rank well. Unfortunately, the impact of speed doesn’t come without a lot of caveats. Explore them here.
 
Screenshot of Perfwork website showing search box and heading "The job board for web performance enthusiasts"
 
### [Perfwork: the job board for web performance enthusiasts](https://www.perfwork.com/)
 
There’s a new, dedicated job board for people who love working on web performance, run by [Tim Kadlec](https://mastodon.social/@tkadlec)!
 
 
 
# Case Studies  
 
Two filmstrips of a backward navigation from an article to the article listing page. The top is a filmstrip of the process being handled with bfcache which takes 0.3 seconds, whereas the bottom is of the same process being handled without bfcache, which takes 3.3 seconds.
 
### [How back/forward cache helped Yahoo! JAPAN News increase revenue by 9% on mobile](https://web.dev/yahoo-japan-news-bfcache/)
 
[Yuriko Hirota](https://www.linkedin.com/in/yurikohirota/)
bfcache enables instant back and forward navigation. Learn how investment in this strategy reduced conversion friction for one of the most popular news platforms in Japan.
 
 
 
# Tools  
 
Screenot of pkg-size analysis for preact. Showing 1.2MB install size and 1 package installed.
 
### [pkg-size: find the true size of an npm package](https://pkg-size.dev/)
 
[Hiroki Osame](https://hirok.io/)
Installing packages looks easy, but are you sure you know the full cost? Find out the indirect dependencies, install and bundle costs for each package.
 
 
 
# Browsers  
 
### [Speeding up V8 heap snapshots](https://v8.dev/blog/speeding-up-v8-heap-snapshots)
 
[José Dapena Paz](https://www.linkedin.com/in/josedapenapaz/)
Find out how Bloomberg engineers identified an issue in capturing memory leaks in Chrome and what it took to find and resolve the issue.
 
 
 
# Courses, Talks & Podcasts  
 
Talk slide stating "Persuading your bosses to prioritize web performance work. Conversion? 2.4s -> 1.9%, 5.7s -> .6%"
 
### [We’re all doing the best we can](https://www.youtube.com/watch?v=MtgrsmaKzDg&ab_channel=JSHeroes)
 
[Jeffrey Lembeck](https://www.jefflembeck.com/)

This talk focuses on common pitfalls developers focusing on web performance face, and discusses how leaders can positively influence prioritising and shipping speed work.

 
 
Calibre
 
This email is brought to you by the team at [Calibre](https://calibreapp.com). We automate web performance testing, reporting and alerting, so you don’t have to.
 
 

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