Python was too slow for 10M rows—So I built a C-Bridge (and found the hidden data loss)

The Challenge: The 1-Second Wall In high-volume data engineering, "fast enough" is a moving target. I was working on a log ingestion problem: 700MB of server logs, roughly 10 million rows. Standard Python line-by-line iteration (for line in f:) was hitting a consistent wall of 1.01 seconds. For a real-time security auditing pipeline, this latency was unacceptable. But speed wasn't the only problem. I discovered something worse: Data Loss. The Silent Killer: Boundary Splits Most standard parsers read files in chunks (like 8KB). If your target status code (e.g., " 500 ") is physically split between two chunks in memory—say, " 5" at the end of Chunk A and "00 " at the start of Chunk B—the parser misses it entirely. In my dataset, standard parsing missed 180 critical errors. The Solution: Axiom-IO (The C-Python Hybrid) I decided to bypass the Python interpreter's I/O overhead by building a hybrid engine. 1. The Raw C Core Using C's fread, I pull raw bytes directly into an 8,192-byte buffer