Quick Tips: Python 3.15 Tachyon - Profile Without Slowing Code Down

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Python 3.15 Tachyon - Profile Without Slowing Code Down

Problem

Python's built-in cProfile can make slow code even slower because it times every function call.

Solution

Python 3.15's Tachyon profiler reduces this overhead by checking the running function once every millisecond.

Other Tachyon features include:

• Attaching to a running program without restarting it
• Generating an interactive flame graph that makes slow functions easy to spot

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Promptfoo - Test LLM Prompts Like Unit Tests

Problem

Prompt testing often starts as a few examples pasted into a chat window.

But once your prompt changes, those examples are hard to rerun consistently across old cases, new cases, and different model providers.

Solution

Promptfoo turns prompt evaluation into unit tests written in YAML, where each test defines the input, provider, and expected behavior.

You can commit the config, review it in pull requests, and run the same tests across OpenAI, Anthropic, Gemini, or local models.

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