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Command evallat times CDP Runtime.evaluate round-trips on one open socket, isolating the evaluate from process startup and dial cost.

Command hardreload reloads a CDP page target bypassing the HTTP cache — what a stale cached bundle needs after the server was rebuilt.

the JSON result — direct Runtime.evaluate, no serve-harness needed.

Command nav navigates a CDP page target to a URL — the missing half of hardreload for driving a fresh tab (PUT /json/new?url= no longer navigates in current Chromium).

Command profile samples a CDP page target's JS CPU profile for N seconds and prints the hottest functions by self time — the diagnostic for "the wasm desk tab pegs a core": a spin loop names itself at the top of this list, where a screenshot or eval cannot (evals queue behind the spin; the profiler runs in the inspector and samples through it).