Python 3.14? That's old news. Let's talk about the first big feature of Python 3.15 -- a built-in sampling profiler for Linux, macOS, and Windows. We also cover improvements in perf support, discuss memory.python.org, and as usual, recent changes in the codebase.

## Timestamps

(00:00:00 ) INTRO

(00:02:43 ) PART 1: THE SAMPLING PROFILER

(00:05:07 ) Built-in profile is bad, long live cProfile

(00:10:54 ) Out-of-process profiling

(00:12:18 ) Shortcuts Compromise Accuracy, Leading Eventually to Numerous Errors

(00:16:07 ) Selfish Łukasz vs benevolent Pablo

(00:23:11 ) How does a sampling profiler even work?

(00:30:42 ) One meeellion huuurtzzz

(00:32:40 ) Free threading makes it extra spicy

(00:41:26 ) AsyncIO makes it even spicier

(00:49:49 ) You made this? I made this

(00:54:06 ) What if the profiled process changes during sampling?

(00:57:33 ) Coming in October 2026

(01:04:30 ) PART 2: PR OF THE WEEEEEEK

(01:14:14 ) memory.python.org launched

(01:23:15 ) PART 3: WHAT'S GOING ON IN CPYTHON

(01:26:45 ) Performance updates

(01:30:24 ) Features & Curiosities

(01:41:45 ) OUTRO