# \#nerdsnipe

**URL:** https://discourse.julialang.org/tag/nerdsnipe/1588.md

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## [Speeding up trig-heavy code](https://discourse.julialang.org/t/speeding-up-trig-heavy-code/134656)

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**Author:** [@langestefan](https://discourse.julialang.org/u/langestefan)\
**Replies:** 26\
**Last updated:** [January 2, 2026, 4:44pm UTC](https://discourse.julialang.org/t/speeding-up-trig-heavy-code/134656 "2026-01-02T16:44:23Z")

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Hello! I recently released v0.3.2 of SolarPosition.jl. I feel like it is now in a position where I am very happy with the performance, at least I think I covered all the basics like type stability covered in Performance…

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## [Most efficient implementation of covariance matrix](https://discourse.julialang.org/t/most-efficient-implementation-of-covariance-matrix/114797)

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**Author:** [@Salmon](https://discourse.julialang.org/u/Salmon)\
**Replies:** 12\
**Last updated:** [May 28, 2024, 10:26pm UTC](https://discourse.julialang.org/t/most-efficient-implementation-of-covariance-matrix/114797 "2024-05-28T22:26:57Z")

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Hi everyone, I was computing some rather large covariance matrices and noticed that that implementation in Statistics is not multithreaded. TLDR, I want the following to be as fast as possible (ideally, for even larger …

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## [Can I speed up this recursive set implementation?](https://discourse.julialang.org/t/can-i-speed-up-this-recursive-set-implementation/113917)

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**Author:** [@gdalle](https://discourse.julialang.org/u/gdalle)\
**Replies:** 38\
**Last updated:** [May 10, 2024, 7:37am UTC](https://discourse.julialang.org/t/can-i-speed-up-this-recursive-set-implementation/113917 "2024-05-10T07:37:37Z")

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Hey there! I come to you with another performance nerdsnipe, whose solution could have a big impact on the autodiff ecosystem (via SparseConnectivityTracer.jl and DifferentiationInterface.jl). You may remember my first…