Does shadow DOM improve style performance? — Nolan Lawson covers how, because of the inherent encapsulation of the shadow DOM, the styling gets applied a bit faster than it would if those styling rules were relevant to the entire page. But as ever, it depends, and it turns out that classes and IDs are actually faster outside of it (?!), so if you just style with those, that’s the way to go.
New HTTP standards for caching on the modern web — Tim Perry gets into two brand new (proposed) caching headers: Cache-Status and Targetted Cache-Control. “These are designed to update HTTP standards to match the reality of the CDN-powered web that exists today, creating specifications that formalize existing practices from popular CDNs.” Feels like good stuff where web standards can come in and fix up a gnarly situation.
Have Core Web Vitals made the web faster? — CWVs were announced in May 2020 and then we were told by May 2021 they would become a factor in SEO. Barry Pollard checks in to see if that big carrot (or stick?) has enticed us all to make sites faster en masse. The answer is complicated because the way CWVs are measured has changed in that time. Some measurements say yes, things are better. But if you use steady alternate measurements from before/after, things look worse. I all depends on what slice of the web you’re looking at.
Image Optimizer — This is an Electron-powered (but macOS only) drag-and-drop image optimizer. Like ImageOptim, I suppose. Both are free.