What’s on the Web Performance poster
A 4-row table: Metric · Good · Improved by.
Core Web Vitals, with the thresholds for a good score.
- LCP — largest paint — < 2.5 s — Preload the hero image, faster server
- INP — interactivity — < 200 ms — Less main-thread JavaScript
- CLS — layout shift — < 0.1 — Width and height on images
- TTFB — first byte — < 800 ms — Caching, CDN, faster backend
JavaScript is the usual cause. It must be downloaded, parsed and executed, and all three block the main thread.
Questions about the Web Performance poster
- What’s on the Web Performance poster?
- A 4-row table: Metric · Good · Improved by. Core Web Vitals, with the thresholds for a good score. LCP — largest paint — < 2.5 s — Preload the hero image, faster server; INP — interactivity — < 200 ms — Less main-thread JavaScript; CLS — layout shift — < 0.1 — Width and height on images; TTFB — first byte — < 800 ms — Caching, CDN, faster backend. JavaScript is the usual cause. It must be downloaded, parsed and executed, and all three block the main thread.
- Who is the Web Performance poster for?
- Web Performance belongs to the Computing section rather than to a school year, because computing is not something one grade owns. Anyone learning the web can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Web Performance poster?
- Measure before optimising. The bottleneck is rarely where it feels like it is. A wall chart earns its place by being glanceable from where the work is happening, so Web Performance belongs on the wall where that computing work actually happens, within glancing distance, rather than filed away.
- What other posters go with Web Performance?
- Accessibility, ARIA and How a Browser Renders sit alongside Web Performance in the Computing section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.AccessibilityARIAHow a Browser Renders
- Is the Web Performance poster free to download and print?
- Yes. Web Performance downloads as a free PDF with no account, no email and no watermark, like everything else in the Computing section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the Web Performance poster print at?
- Web Performance is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Web Performance loses nothing.Printing guide
Related posters
Charts that sit alongside Web Performance on the same wall.
Browse every Computing poster, or start from the full catalogue.