14.15 Performance Engineering & Precision

1. What It Is in Plain Words

Performance engineering optimizes software to maximize throughput and minimize latency while maintaining mathematical correctness.

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2. How This Project Uses It

In models/proration.py and rating/engine.py:

• Integer Arithmetic: Avoids floating-point conversions; rating operations execute in pure integer CPU registers.
• In-Memory Rating: Zero database queries during rating calculations; price book entries are pre-fetched.

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3. 30-Second Interview Answer

"We achieve high performance by eliminating floating-point math across all calculation paths. Monetary amounts are represented as integer cents, allowing rating operations to execute directly in native CPU integer registers in under 5 microseconds per line item with zero memory allocation overhead."