I am seeing some slowness in my init file loading:

```
$ time emacs --debug-init -eval '(kill-emacs)' -Q

real    0m0.672s
user    0m0.338s
sys     0m0.057s

$ time emacs --debug-init --eval '(kill-emacs)'

real    4m17.821s
user    0m2.769s
sys     0m0.226s

```

These 4mins of loading is reproducible. Actually looks like a timeout. It happens when I do `(require 'magit)`. But I don't think it's related to magit because `(require 'helm-gtags)` causes the same slowness.

However `--debug-init` is not activated when I press C-g during the time emacs is unresponsive. Obviously is not activated either after the load finishes because there's no error.

I am wondering how I can understand where the slowness comes from. I guess a backtrace at the point of slowness would be nice. Maybe some tracing facility?