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7/19/2026
gRPC over QUIC: faster seeks, slower bulk

gRPC over QUIC: faster seeks, slower bulk

Short summary

Detailed engineering notes from moving KeibiDrop, a post-quantum encrypted P2P filesystem, from gRPC over TCP to gRPC over QUIC. On a real 72ms WAN link, QUIC delivers 28x faster random seeks (109ms vs 3s) because each seek gets its own stream, but loses to TCP by up to 16x on bulk transfer under Wi-Fi loss. The final design uses QUIC for interactive on-demand reads and TCP for bulk on lossy links.

  • •QUIC connection migration survives IP changes; TCP cannot
  • •Random seeks 28x faster on QUIC (109ms vs 3s) due to stream isolation
  • •Bulk transfer up to 16x slower on QUIC under Wi-Fi loss; hybrid design recommended

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