⚡️ Speed up method CodeCommitProvider._get_language_percentages by 68%

[codeflash-ai]

📄 68% (0.68x) speedup for CodeCommitProvider._get_language_percentages in pr_agent/git_providers/codecommit_provider.py

⏱️ Runtime : 8.98 microseconds → 5.35 microseconds (best of 80 runs)

📝 Explanation and details

The optimization achieves a 67% speedup by replacing Python's Counter class with manual dictionary accumulation and pre-computing the division factor.

Key optimizations applied:

1. Eliminated Counter overhead: Replaced Counter(extensions) with a simple dictionary and manual counting using counts.get(ext, 0) + 1. This avoids the overhead of Counter's constructor and internal optimizations that aren't beneficial for small datasets.

2. Hoisted division operation: Pre-computed inv_total = 100 / total_files once instead of performing division for each language in the dict comprehension. This transforms count / total_files * 100 into count * inv_total, reducing repeated division operations.

3. Separated dict construction: Replaced the dict comprehension with explicit loops, which eliminates the overhead of comprehension setup and allows for more predictable memory access patterns.

Why this works:

• Counter is optimized for large datasets and complex counting scenarios, but introduces unnecessary overhead for simple extension counting
• Division is more expensive than multiplication in Python, so pre-computing the inverse factor provides measurable gains
• The explicit loop approach has better cache locality and fewer function call overheads compared to the comprehension + Counter combination

Performance characteristics:
The line profiler shows the Counter operation took 61.2% of the original runtime (22,760ns), while the manual counting approach distributes the work more efficiently across multiple lighter operations. This optimization is particularly effective for small to medium-sized file lists (typical PR scenarios) where Counter's optimizations don't justify its setup costs.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	✅ 13 Passed
🌀 Generated Regression Tests	🔘 None Found
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

⚙️ Existing Unit Tests and Runtime

Test File::Test Function	Original ⏱️	Optimized ⏱️	Speedup
unittest/test_codecommit_provider.py::TestCodeCommitProvider.test_get_language_percentages	8.98μs	5.35μs	67.9%✅

To edit these changes git checkout codeflash/optimize-CodeCommitProvider._get_language_percentages-mgzjfe4q and push.