Spade shape with cobalt blue background

Performance Newsletter

Archives
Calibre Monitoring
Free Speed Tools
Log in
Subscribe
17 October 2023

⚡ 137: How hydration slows performance

͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
 
Performance Newsletter
[issue 137]()
 
#### Editor’s note
 
Compute isn’t cheap. And by cheap, I’m not speaking about the monetary cost, but the cost to the planet. The emissions from cloud computing already surpassed the airline industry, as outlined in this issues’ research paper. A single data centre can consume the [energy required to power 50,000 homes](https://thereader.mitpress.mit.edu/the-staggering-ecological-impacts-of-computation-and-the-cloud/). Not mentioning the noise pollution, [water scarcity](https://theconversation.com/we-are-ignoring-the-true-cost-of-water-guzzling-data-centres-167750) and the hugely negative implications of [training AI models](https://arstechnica.com/gadgets/2023/04/generative-ai-is-cool-but-lets-not-forget-its-human-and-environmental-costs/).
 
The frugal and sustainable approach lends itself perfectly both to web performance and the environmental movement. While we build more, add more, process more, we should be asking: is this really needed and what is the cost?
 
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  
 
Illustration stating "Hydration slows performance by default" with three options listed: eager execution, limited lazy loading and render tree traversal
 
### [Hydration, the saboteur of lazy loading](https://www.builder.io/blog/hydration-sabotages-lazy-loading)
 
[Miško Hevery](https://github.com/mhevery)
What are the constraints and negative impact of specific hydration strategies? Find out strategies and alternatives in this thorough write-up (with examples).
 
A code snippet for a responsive video HTML tag
 
### [We’re bringing responsive video back](https://scottjehl.com/posts/responsive-video/)
 
[Scott Jehl](https://scottjehl.com/)
We focused so much on responsive imagery, but what about video? Responsive video is again a web standard—learn how you can make use of it today!
 
Actual and projected emissions from computing (pro- duction+operation), and 2040 emission target to limit warming to ≤1.5ºC
 
### [Frugal Computing: on the need for low-carbon and sustainable computing](https://arxiv.org/pdf/2303.06642.pdf)
 
[Wim Vanderbauwhede](https://www.dcs.gla.ac.uk/~wim/)
Current computing emissions already surpass emissions from the airline industry. What is the future vision for zero-carbon computing?
 
 
 
# Courses, Talks & Podcasts  
 
What are good vs. bad goals listing p50 and p90 being bad goals for latency, but TM99 is a good goal
 
### [How Amazon uses better metrics for improved website performance](https://d1.awsstatic.com/events/Summits/reinvent2022/AMZ302_How-Amazon-uses-better-metrics-for-improved-website-performance.pdf)
 
[Jim Roskind](https://www.linkedin.com/in/jim-roskind-19520/) & [Frank Stone](https://www.linkedin.com/in/frankgstone/)
Find out what data is hidden when using p50 and p90 as guardrails and how to visualise as well as interpret performance data more holistically.
 
Graphic saying "SPA is one attempt to work around this" following by a spinner loader image and text "Spinner Page Application"
 
### [Better than loading fast… is loading instantly](https://docs.google.com/presentation/d/1oEaW5dn7sTko7GdyqaJ_-meEfHLguG__nLDeWla58A8/edit?pli=1#slide=id.p)
 
[Barry Pollard](https://www.tunetheweb.com/)
Learn tools and strategies that help be less reliant on client-side processing and network to deliver instant experiences.
 
 
# New in Calibre  
 
Preview of performance review posted in GitHub showcasing Core Web Vitals and assets transferred
### [New performance report for Pull Requests](https://calibreapp.com/changelog#10-new-pr-reviews-report)
Do you like being proactive about performance? Us too! That’s why we refreshed the report Calibre posts on Pull Requests to give you the necessary information, so you can decide whether to merge or not.
 
 
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.
 
 

Performance Newsletter is sent from the traditional lands of the Wurundjeri people of the Kulin nation. We acknowledge that sovereignty was never ceded and pay respects to the Elders past and present.

Send your suggestions, links and feedback to [[email protected]](mailto:[email protected]).

[View or share this email →]()
[Quickly unsubscribe →]()
[Browse older issues →]()

**Sent by**
Calibre Analytics

V119 / 425 Smith Street
Ngár-go
Fitzroy VIC 3065
Australia

 
Don't miss what's next. Subscribe to Performance Newsletter:
← Newer ⚡ 138: Who to trust with online business? Older → ⚡ 136: Low-quality image placeholders for performance
perf.email
Bluesky
LinkedIn