https://bsky.app/profile/paulcalvano.bsky.socialhttps://bsky.app/profile/paulcalvano.bsky.social/post/3mfpseaxkx22tInterested in the @httparchive.org and not sure where to start? During the @performanceobserver.dev meetup tomorrow (12:30pm ET), I'm going to be providing an overview of the HTTP Archive and demonstrate how to start querying it! https://performanceobserver.dev/events/episode-10/ [contains quote post or other embedded content]25 Feb 2026 23:08 +0000at://did:plc:2w3mvlkyixxbyuigwuo47lu7/app.bsky.feed.post/3mfpseaxkx22thttps://bsky.app/profile/paulcalvano.bsky.social/post/3meo62v2j4c27I’ll be giving a talk about Fonts and Web Perfomance at the Tech SEO Summit in Hamburg, Germany on April 23rd. They have only a few tickets remaining if anyone wants to attend! tech-seo-summit.com https://tech-seo-summit.com12 Feb 2026 14:07 +0000at://did:plc:2w3mvlkyixxbyuigwuo47lu7/app.bsky.feed.post/3meo62v2j4c27https://bsky.app/profile/paulcalvano.bsky.social/post/3meghhimes22yA shocking 8.5% of sites that use CDNs deliver some static content directly to end users via cloud storage! Many are not compressing or caching this content either. This comes at a significant performance cost. Details, examples and @httparchive.org stats here - https://paulcalvano.com/2026-02-09-serving-static-content-with-cloud-storage-dont-forget-the-cdn/09 Feb 2026 12:34 +0000at://did:plc:2w3mvlkyixxbyuigwuo47lu7/app.bsky.feed.post/3meghhimes22yhttps://bsky.app/profile/paulcalvano.bsky.social/post/3mcxxztsypc2jTomorrow at 6pm the @nywebperf.com meetup is running another in person "Meet for Speed" session. We take requests from attendees for sites to do a webperf analysis on. @fastly.com is hosting us at their office in Union Square. Have a site you'd like us to analyze? https://bit.ly/meet4speed-submit [contains quote post or other embedded content]22 Jan 2026 00:55 +0000at://did:plc:2w3mvlkyixxbyuigwuo47lu7/app.bsky.feed.post/3mcxxztsypc2jhttps://bsky.app/profile/paulcalvano.bsky.social/post/3mb556ndrc22tMy contribution to this years Web Performance Calendar is all about Third Parties and Single Points of Failure (SPOF). Based on @httparchive.org data I found that 67% of websites have at least 1 render blocking third party - and quite a few of them are SPOF risks! [contains quote post or other embedded content]29 Dec 2025 15:20 +0000at://did:plc:2w3mvlkyixxbyuigwuo47lu7/app.bsky.feed.post/3mb556ndrc22thttps://bsky.app/profile/paulcalvano.bsky.social/post/3lwvxehobek2kNew @httparchive.org analysis about sites adding AI Bots and Crawlers to their robots.txt files. While robots.txt doesn't "block" bots by itself, it's a clear demonstration of the preferences of site owners and the sentiment towards AI crawlers on today's web. https://paulcalvano.com/2025-08-21-ai-bots-and-robots-txt/21 Aug 2025 12:35 +0000at://did:plc:2w3mvlkyixxbyuigwuo47lu7/app.bsky.feed.post/3lwvxehobek2khttps://bsky.app/profile/paulcalvano.bsky.social/post/3luirxb57yc2xThis Thursday at 6pm the NYC WebPerf Meetup is running another in person "Meet for Speed" session. We'll be taking requests from attendees for sites to do a web performance analysis on. https://www.meetup.com/web-performance-ny/events/308528786/ Have a site you'd like us to analyze? Add it here - https://bit.ly/meet4speed-submit21 Jul 2025 20:04 +0000at://did:plc:2w3mvlkyixxbyuigwuo47lu7/app.bsky.feed.post/3luirxb57yc2xhttps://bsky.app/profile/paulcalvano.bsky.social/post/3ldoakpnov22cTonight at 6pm the NYC WebPerf Meetup is running another in person "Meet for Speed" session. We'll be taking requests from attendees for sites to do a web performance analysis on. Fastly will be hosting us at their NYC office. https://www.meetup.com/web-performance-ny/events/304709044/ https://www.meetup.com/web-performance-ny/events/304709044/?eventOrigin=group_upcoming_events19 Dec 2024 16:00 +0000at://did:plc:2w3mvlkyixxbyuigwuo47lu7/app.bsky.feed.post/3ldoakpnov22chttps://bsky.app/profile/paulcalvano.bsky.social/post/3ldk6sfc3a227The video of my talk from the Performance Now conference in Amsterdam was posted today. #perfnow [contains quote post or other embedded content]18 Dec 2024 01:18 +0000at://did:plc:2w3mvlkyixxbyuigwuo47lu7/app.bsky.feed.post/3ldk6sfc3a227https://bsky.app/profile/paulcalvano.bsky.social/post/3lcfxi7vf6s2wThis Friday afternoon I'll be at the Boston Web Performance meetup giving my talk on "Performance Mistakes". If you are in the Boston area and interested in web performance, join us! https://www.meetup.com/boston-web-performance/events/304542099/03 Dec 2024 15:31 +0000at://did:plc:2w3mvlkyixxbyuigwuo47lu7/app.bsky.feed.post/3lcfxi7vf6s2whttps://bsky.app/profile/paulcalvano.bsky.social/post/3lbcdm5ogd22dLast week I gave a talk at the #PerfNow conference titled “Performance Mistakes”. I started off explaining a bit about Etsy’s blameless culture, and how it’s ok to make mistakes. Then I shared 17 common #webperf mistakes using @httparchive.org data, with examples. https://www.slideshare.net/slideshow/performance-now-24-performance-mistakes-final-pdf/27343110119 Nov 2024 11:32 +0000at://did:plc:2w3mvlkyixxbyuigwuo47lu7/app.bsky.feed.post/3lbcdm5ogd22d