How browsers schedule and execute scripts can impact the performance of web pages. While techniques like
<link rel=preload> (and others) influence script loading, knowing how browsers interpret them can also be helpful. Thanks to Kouhei Ueno, we now have an up to date summary of script scheduling in Chrome.
Note: Loading priorities are not guaranteed to be consistent cross-browser so use this knowledge wisely and measure when unsure. Ideally, aim to delivery a great experience to the widest number of users possible.
If you’re a web developer wondering where you can see the “Loading Priority”, Chrome DevTools has…
Performance is a constant process, not a one-time checklist. It requires continuous monitoring and work. A useful workflow when investing in performance is Measure, Optimize & Monitor.
A few tips:
Netflix is one of the most popular video streaming services. Since launching globally in 2016, the company has found that many new users are not only signing up on mobile devices but are also using less-than-ideal connections to do so.
If you’re building a web experience and want to stay fast, a performance budget can be critical. For success, embrace performance budgets and learn to live within them. Network & CPU limits on mobile can require asking hard questions like, “what is really important to my users?”
When we talk to Fortune 500 companies that put in the work to improve performance, perf metrics will often rapidly regress once they return to feature development. Performance budgets help teams prioritize features, optimizations and facilitate discussions on what is really important to users.
“Having a pre-defined ‘budget’ is a clear, tangible way…
tl;dr: less code = less parse/compile + less transfer + less to decompress
This is validated using Lighthouse on average mobile hardware (a Moto G4) using WebPageTest’s Faster 3G and Emerging Market 3G profiles.
We started off with apps written in Polymer, Vue, Preact, React, Svelte and Angular and thanks to the community have grown to 22 applications.
Treebo is India’s top rated budget hotel chain, operating in a segment of the travel industry worth $20 billion. They recently shipped a new Progressive Web App as their default mobile experience, initially using React and eventually switching to Preact in production.
What they saw compared to their old mobile site was a 70%+ improvement in time to first paint , 31% improvement in time-to-interactive. and loaded in under 4 seconds over 3G for many typical visitors and on their target hardware. …
Eng. Manager at Google working on Chrome • Passionate about making the web fast.