wingfoil latency e2e

Each fill traverses nine wingfoil stamp points: ws_recv → ws_publish → gw_recv → gw_price → fix_send → fix_recv → gw_publish → ws_sub_recv → ws_send. The chart plots the per-hop delta on a log Y-axis (nanoseconds). The flamegraph below shows the nested call stack: browser at the bottom (full round-trip), each layer above is a strict sub-interval of the layer below — exactly like a CPU flamegraph, but the samples are wall-clock fills.

Resident is everything inside this server (two processes connected by iceoryx2 shared memory). Wire is the FIX-over-TLS round-trip to LMAX plus the WebSocket legs to your browser — derived as rtt_total − resident, both measured in a single clock domain so no NTP sync is needed.