The transition waited for the new page to replace its route fallback and
polled for that with requestAnimationFrame. While a view transition waits
for its update the browser renders no frames, so the callback never fired
and every navigation to a page whose chunk was still loading sat frozen
until the browser gave up after four seconds. The wait now polls with a
timer: from Vacay to the journal takes 0.45 s instead of 4.1 s with an
empty cache.
Maurice
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