Born in California, made in Germany. Loves making music, hiking and running. Blogs at https://screenspan.net.https://bsky.app/profile/screenspan.nethttps://bsky.app/profile/screenspan.net/post/3m4l5y3brok2x@riccardomargiotta.co.uk https://youtu.be/HMq-qAn3otE?si=wsh50OnBCeOVsv4Y ;-)01 Nov 2025 14:06 +0000at://did:plc:mitecap7dnui637hxvctpskd/app.bsky.feed.post/3m4l5y3brok2xhttps://bsky.app/profile/screenspan.net/post/3m4l4qc2lhd2jI've been working on RUM-based alerting and got to share some lessons learned at Performance.sync() in Amsterdam this week. Here are my slides: https://screenspan.net/talks/noise-cancelling-rum-based-alerting/01 Nov 2025 13:43 +0000at://did:plc:mitecap7dnui637hxvctpskd/app.bsky.feed.post/3m4l4qc2lhd2jhttps://bsky.app/profile/screenspan.net/post/3m4l42ottnk2jThis marks my fifth year attending my favorite conference, #perfnow in Amsterdam. Again, I leave super-charged from the inspiring talks, nerdy chats and unforgettably fun times. The perf community is just so amazing!01 Nov 2025 13:31 +0000at://did:plc:mitecap7dnui637hxvctpskd/app.bsky.feed.post/3m4l42ottnk2jhttps://bsky.app/profile/screenspan.net/post/3ld6jytfhdc2d📈 Real User Monitoring (RUM) is crucial for identifying issues on websites and tracking regressions. But the challenge multiplies when monitoring hundreds or thousands of sites. I got to share insights into our collaborative efforts in Amsterdam in Nov.: https://www.youtube.com/watch?v=XBsvaQ5hpI4&list=PLjnstNlepBvOm686RUk2yWaX8ELBwJskS&index=713 Dec 2024 10:06 +0000at://did:plc:mitecap7dnui637hxvctpskd/app.bsky.feed.post/3ld6jytfhdc2dhttps://bsky.app/profile/screenspan.net/post/3lcnm3xpza225Hi support@bsky.app, I've been enjoying BSKY :-) Just wanted to point out something that @kojordan.com spotted: the app is loading TTF fonts, which are very large. You should be using WOFF2 – and if you're preloading them, you need the "crossorigin" attribute :-)06 Dec 2024 16:29 +0000at://did:plc:mitecap7dnui637hxvctpskd/app.bsky.feed.post/3lcnm3xpza225https://bsky.app/profile/screenspan.net/post/3lcfir6csj22sAs a #webperformance engineer I often have to look at “waterfall charts” to see when network requests occur to spot bottlenecks. I wondered what they might SOUND like, so made a little tool to listen to them. https://calendar.perfplanet.com/2024/how-does-web-performance-sound/ screenspan.net/soundtrace03 Dec 2024 11:08 +0000at://did:plc:mitecap7dnui637hxvctpskd/app.bsky.feed.post/3lcfir6csj22shttps://bsky.app/profile/screenspan.net/post/3lbwo2wmxfk2yI've been thinking about running a small programming workshop for children 7-8 years old at my daughter's school. Anyone have any experience doing something like that? Any offline exercises to get started? What worked well / not so well?27 Nov 2024 13:33 +0000at://did:plc:mitecap7dnui637hxvctpskd/app.bsky.feed.post/3lbwo2wmxfk2yhttps://bsky.app/profile/screenspan.net/post/3lbkeklzyhs2fUpdated my handle to @screenspan.net thanks to a little help from my friends (i.e. @sia.codes) 🙏🏽. I thought I had to install Ubuntu on my server and install a PDS as stated on the help page (https://atproto.com/guides/self-hosting). But all I had to do was add a TXT record to my DNS panel in Netlify. Super EZ 😎22 Nov 2024 16:11 +0000at://did:plc:mitecap7dnui637hxvctpskd/app.bsky.feed.post/3lbkeklzyhs2fhttps://bsky.app/profile/screenspan.net/post/3lbjtmhxcxs2fPlease don't use JavaScript to determine which layout version to use on a device, otherwise the layout may shift. I spotted a customer loading a desktop version by default and using JS to load the mobile version on a mobile device, and was able to see the DOM diff by dis-/enabling JS in DevTools.22 Nov 2024 11:07 +0000at://did:plc:mitecap7dnui637hxvctpskd/app.bsky.feed.post/3lbjtmhxcxs2fhttps://bsky.app/profile/screenspan.net/post/3lbhb3be7ys23Dunno what the etiquette is here. An introductory post? I'm a web performance engineer based in Germany and will probably post mostly about related stuff. I'm not terribly excited to join yet another social media platform and hope this one stays positive.21 Nov 2024 10:30 +0000at://did:plc:mitecap7dnui637hxvctpskd/app.bsky.feed.post/3lbhb3be7ys23