For my package KiteModels.jl I compared the time it took to run my install script.
time ./install
Julia 1.10: 5:40 minutes
Julia 1.11: 9:30 minutes
Julia 1.12: 9:27 minutes
Julia 1.13: 7:51 minutes
This includes the time to install Julia itself, because before the tests, I deleted the .julia folder. This is in a virtual machine, running Ubuntu 22.04 on a Ryzen 7950X CPU.
This indicates that Julia 1.13beta3 is 17% faster than Julia 1.12 for installing and pre-compiling packages, but still 28% slower than 1.10.