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Loading FastTransforms.jl can make FFTs via FFTW.jl 100x slower due to threading conflicts

Status: Open.

#267 In JuliaApproximation/FastTransforms.jl;

· ranocha opened on Apr 9, 2026

plan_transform fails with 3D Ultraspherical tensor product

Status: Open.

#266 In JuliaApproximation/FastTransforms.jl;

· Jpunter16 opened on Feb 28, 2026

LibFastTransforms crashing in tests on 1.12

Status: Open.

#263 In JuliaApproximation/FastTransforms.jl;

· dlfivefifty opened on Oct 9, 2025

Unwanted sine modes appearing in convolution using FFT

Status: Open.

#257 In JuliaApproximation/FastTransforms.jl;

· pw0908 opened on Jan 15, 2025

Allocating lmul!

Status: Open.

#253 In JuliaApproximation/FastTransforms.jl;

· rveltz opened on Sep 12, 2024

Can't use empty vectors in th_cheb2leg or th_leg2cheb

Status: Open.

#248 In JuliaApproximation/FastTransforms.jl;

· DanielVandH opened on Jul 21, 2024

Illegal instruction on macos in ft_plan_chebyshev_to_jacobi or plan_cheb2leg

Status: Open.

#246 In JuliaApproximation/FastTransforms.jl;

· jishnub opened on Jun 10, 2024

Segmentation fault for spherical harmonic transform

Status: Open.

#238 In JuliaApproximation/FastTransforms.jl;

· AshtonSBradley opened on Dec 4, 2023

Move out forwardrecurrence and clenshaw

Status: Open.

#217 In JuliaApproximation/FastTransforms.jl;

· dlfivefifty opened on Apr 4, 2023

Add multidimensional interface for lib transforms

Status: Open.

#210 In JuliaApproximation/FastTransforms.jl;

· dlfivefifty opened on Mar 27, 2023

Use Toeplitz-dot-Hankel for very large dimensional transforms

Status: Open.

#209 In JuliaApproximation/FastTransforms.jl;

· dlfivefifty opened on Mar 27, 2023

cheb2ultra seems unreasonably slow

Status: Open.

#204 In JuliaApproximation/FastTransforms.jl;

· jishnub opened on Mar 26, 2023