Instead of loading elisp packages at start-up or on-demand, load them when Emacs is idle for a longer period of time.
(require 'idle-require) (setq idle-require-symbols '(cedet nxml-mode)) ;; <- Specify packages here. (idle-require 'cedet) ;; <- Or like this. (idle-require-mode 1)
As soon as Emacs goes idle for idle-require-idle-delay seconds, idle-require-mode will start loading the files, symbols or functions in idle-require-symbols. If that is nil, all autoload functions will be loaded, one at a time.
Use idle-require-load-break to give your CPU a break between each load. Otherwise, you might create 100% CPU load on your system.
If you have any feedback, please email me, or visit this package's page at the Emacs wiki.