Is there an efficient way to tell which parts of my startup of Emacs take the longest to load?

Question

I have been trying to make the start-up times better. Almost all of my init.el is broken into use-package declarations like this:

(use-package x ...)
(use-package y ...)
(use-package z ...)

I want to start optimising those parts of the init.el that take the longest. Is there a way to do something like,

(use-package x ...)
; print load time for x
(use-package y ...)
; print load time for y
(use-package z ...)
; print load time for z

I know for the entire file you can do something like this (message (time-subtract after-init-time before-init-time))

Have you tried customising `use-package-verbose` and `use-package-minimum-reported-time`? — Basil, Mar 11 '21 at 23:40

score 6 · Accepted Answer · answered Mar 12 '21 at 00:24

This does it:

(setq
  use-package-verbose t
  use-package-minimum-reported-time 0)

We get in *Messages*:

Loading package x...done (0.021s)
Configuring package x...done (0.020s)
Loading package y...done (0.025s)
Configuring package y...done (0.020s)
Loading package z...done (0.041s)
Configuring package z...done (0.020s)

Is there an efficient way to tell which parts of my startup of Emacs take the longest to load?

1 Answers1