demo · v132

First-click latency — the interaction case

Google Workspace reported 5–7% cold-load wins from eager compile hints; the bigger story is interaction latency. Generate two large handler libraries — one with //# eagerCompilation=all, one without — then click each button and watch the first-click time delta.

library A — no hint (lazy)

— ms

library B — eagerCompilation=all

— ms
// Library B starts with:
//# eagerCompilation=all

// Library A starts with no comment.

// Each library defines N closures; the click handler invokes them
// in a hot loop. Lazy library: first call pays compile cost for
// the whole call graph. Eager library: cost was paid at script load.

see also