When optimizing Python, many developers reach for __slots__ to save memory and speed up attribute access. But much of the common wisdom about this feature is outdated. On modern Python, long-held assumptions often fail—and subtle misconfigurations can quietly make code slower and less efficient.

Is your knowledge current, or are your optimizations working against you? This session cuts through the myths with fresh data, shows you how to spot hidden traps, and helps you ensure __slots__ delivers real performance gains—not surprises.