Vectorized Backtesting with Pandas: 100x Faster Than Loops

Row-by-row loops in backtesting are an anti-pattern that will have you waiting 30 minutes for a 1-year backtest. Vectorized operations across DataFrames give you the same results in under 20 seconds.

Core Takeaway

Apply these patterns in a controlled environment first, then move into staged deployment once risk checks and validation are complete.