Below roughly 400 milliseconds of system response, people stop waiting on the machine and productivity rises sharply.
Law · Performance
Tag
performance
Entries tagged performance, drawn from across the library. Tags cut through the section structure, which is where most of the useful connections are.
19 entries across 5 sections
Type
Category
Level
19 entries
Absorbed, effortless concentration occurs when challenge and skill are balanced, and interruptions destroy it.
Psychology · Engagement
Interface typefaces are chosen for legibility at small sizes and complete character coverage, not for character.
UI foundation · Typography
One file containing a continuous range of weights and widths, usually smaller than the static weights it replaces.
UI foundation · Typography
Simulated light, which reads as physical only when it follows one consistent light source.
UI foundation · Form and depth
Images either carry information or they do not, and the ones that do not are costing you load time.
UI foundation · Form and depth
Animation should explain a change, and anything that does not explain something is delay.
UI foundation · Form and depth
Suggestions as the user types, which turns recall into recognition when it is fast enough.
Pattern · Finding
What to show while waiting, chosen by how long the wait is and whether its length is known.
Pattern · Content states
Apply the change immediately and reconcile with the server afterwards, so the interface never waits on the network.
Pattern · Content states
Three ways to handle long result sets, each with a different cost, and the right choice depends on the task.
Pattern · Finding
Making content findable by search engines, which overlaps almost entirely with making it good for people.
UX writing · Content
Say what is happening, how long it will take if you know, and whether it is safe to leave.
UX writing · UX writing
Speed is a usability property, and the metrics that matter are the ones measured on real devices.
UI foundation · Performance
Touch targets, reach, input, performance and the assumptions that only fail on a phone.
Checklist · Mobile
The pass before shipping, covering states, edge cases, accessibility, performance and the things that only break in production.
Checklist · Release
A review pass for anything that lives at a URL: addressability, navigation, performance, content and the browser behaviours people expect.
Checklist · Web
Built into Chrome, covering performance, accessibility, SEO and best practices in one run.
Tool · accessibility
Detailed performance testing from real devices and locations, with filmstrips that show what the page looked like while it loaded.
Tool · testing