Comment by Joker_vD

It's small, but not unnoticeable... depending on the exact size of the workload and the amount of computation per element. In fact, for huge arrays it may be beneficial to have structs packed if that leads to less memory traffic.

[0] https://jordivillar.com/blog/memory-alignment

[1] https://lemire.me/blog/2012/05/31/data-alignment-for-speed-m...

[2] https://lemire.me/blog/2025/07/14/dot-product-on-misaligned-...