demo · v139

Connection Pool Simulator

Chrome's TCP connection pool now resizes dynamically based on observed network conditions. Tile-heavy sites (maps, image grids) get smoother throughput. Tune RTT and concurrency below to compare a fixed pool vs. the v139 adaptive pool.

120ms
64
24

fixed pool (6/origin)

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total wall time (ms)

v139 adaptive pool

—
total wall time (ms)

the change

// No API change. The browser's per-origin TCP pool now grows
// when many concurrent requests are queued and RTT is high.
// Pre-v139: fixed cap of ~6 sockets per origin.
// v139:     pool scales up to ~32 based on observed pressure.

see also