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perf: pcap_ct extraction is about 2.3x slower on Python 3.15 than on 3.12-3.14 #2110
Description
The engine benchmark regenerated in #2109 shows pcap_ct taking 0.27 ms per packet on Python 3.15, against about 0.117 ms on 3.12–3.14. That is roughly 2.3× slower. All three passes agreed (0.2725, 0.2696 and 0.2702), so it is not noise. The other engines show no such jump.
Unknown: whether the cost is in pcap_ct itself, a ctypes change in 3.15, or the libpcap build in the python:3.15-slim-bookworm image (3.15.1).
Next step: profile PCAP_CT extraction on 3.14 and 3.15 in the benchmark images, compare cProfile call counts and cumulative times, and report where the extra time goes before proposing a fix.
Activity
perf(foundation): find pcap distributions without parsing METADATA (#…