TCP slow start algorithm begins by sending only 10 packets (approximately 14KB) before waiting for acknowledgment, then doubles the packet count with each successful round trip. This means websites under 14KB can load significantly faster than those requiring multiple round trips, with potential savings of 600+ milliseconds on high-latency connections like satellite internet. The rule applies even to HTTP/2 and HTTP/3/QUIC protocols, making it crucial for optimizing critical above-the-fold content and initial page loads.
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