pocketfft

Requires manual management of strides, shapes, and axes in bytes, which can be error-prone and less intuitive compared to libraries with higher-level abstractions or automatic memory handling.

Multi-threading is only supported for multidimensional transforms and disabled for 1D transforms, as noted in the README, potentially limiting performance scalability in single-axis applications.

Plan caching is turned off by default (POCKETFFT_CACHE_SIZE undefined) to save memory, meaning repeated 1D transforms may incur plan creation overhead unless explicitly configured, impacting performance.

The README is technically dense with minimal examples or tutorials, assuming prior FFT knowledge, which can make onboarding difficult for developers new to Fourier transforms.