NTuple byte copies run about 5x slower in Julia
Copying an NTuple{UInt8} into Memory{UInt8} or Vector{UInt8} runs about 5x slower on current Julia than on 1.8.5 due to single-byte vectorizer copies.
Tier II · Emerging Problems that are still building up.
4 public reports · first reported 25 September 2026 · last reported 28 September 2026
What's going wrong
Developers using Julia report that copying an NTuple of UInt8 values into a Memory{UInt8} or Vector{UInt8} is roughly five times slower on recent Julia releases than on version 1.8.5.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
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