# Example of optimizing performance in Python data analysis
import pandas as pd
import numpy as np
# Create a large DataFrame
n = 10**6
df = pd.DataFrame({
'A': np.random.rand(n),
'B': np.random.rand(n)
})
# Using vectorized operations for performance
df['C'] = df['A'] + df['B']
# Using built-in functions for fast aggregation
result = df['C'].mean()
print(result)
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