CatPaw v0.2.1

Pages load faster. A profile of real sites (catpaw fetch --js --profile, new) showed their time going to waiting for the network one
thing at a time, not to their scripts:

• The imports of a module load side by side, as a browser loads a module
  graph; they were fetched one after another, each waiting its turn. An
  import map's bare specifiers are started ahead too, and
  <link rel="modulepreload"> is honoured.
• A frame's document loads off the page's thread, as a browser loads
  one: the page's scripts, timers and other frames run meanwhile, and the
  page waits for it as for a request of its own, under the settle
  policy's rules (a frame on an ignored host never holds an action up, a
  slow third party's for three seconds at most). The page used to fetch
  each frame's document in turn before going on, a frame that did not
  answer costing up to eight seconds a redirect hop. A frame that opens
  now runs before its parent's clock moves on, so its load fires where
  a browser's would, before the parent's later timers.
• The external scripts a document names are fetched before the parser
  reaches them, as a browser's preload scanner has them: a script the
  parser waits for no longer holds up the ones after it.
• catpaw fetch --js --profile tells where a page's time went: the event
  loop's steps by kind, scripts by source (compiling apart from running),
  parsing, rendering, and the waits for the network.

On the sites measured, the time waiting for the network fell by a third
to a half (github.com 13 s to 6–8 s on a quiet network, techcrunch.com
35 s to 16–17 s, figma.com 19 s to 13 s, crates.io 6.5 s to 4.4 s).
Network latency sets the rest: on these sites the scripts themselves
took 0.3–3 s a page, with a few heavy ones (an obfuscated bot check that
runs for the whole 10 s script budget) as the exceptions.

Install

macOS (Apple silicon) and Linux (x86_64, aarch64):

curl -fsSL https://catpaw.sh/install.sh | sh

Windows (PowerShell):

irm https://catpaw.sh/install.ps1 | iex

The scripts download the archive for your system from this release and
check it against SHA256SUMS. Or download an archive below, check it
(sha256sum -c SHA256SUMS --ignore-missing), and put catpaw on your
PATH. Then connect it to your agent:

catpaw setup claude-code

Intel Macs and other systems: cargo install catpaw (Rust 1.91 or
later) builds it, see the README.