init.el: improve startup time
init.el: improve startup time

Set variable gc-cons-threshold to a higher value than the default. This
reduces the number of times the GC kicks in while Emacs is
starting (from 50+ to 3) and makes Emacs start faster. On OSX this trick
shaves about a second of startup time.

pkryger/exordium,jbibollet/exordium,psipika/exordium,philippe-grenet/exordium,fcassirer/dot.emacs,steve-downey/dot.emacs