A monthly check that has failed twice in two years, reporting clean for the fourteenth consecutive month. A check that has stopped failing is either a solved problem…
A transient holding an expensive query result, expiring at a fixed time, and four hundred requests recomputing it simultaneously. The stale copy with a longer lifetime is what…
6.8 prefetches links on hover by default, which is free performance except where a link has a side effect. A GET request that changes state is the anti-pattern…
A variable font covering Latin, Cyrillic and Greek, on a site that renders English and Turkish. Subsetting is the largest single win available on a page whose largest…
Four interactive blocks on a page, each shipping its own approach to the same problem. Four independent solutions to the same class of problem is what happens when…