Disable population of `file-name-history', it causes calls to
abbreviate-file-name => file-name-case-insensitive-p => tramp-autoload-file-name-handler
taking 40% of startup time.
`ido-switch-buffer' doesn't depends on `file-name-history', nothing to lose.
Profiling data for startup:
- eval-buffer 4340 99%
- recentf-mode 1684 38%
- recentf-load-list 1684 38%
- mapcar 1684 38%
- abbreviate-file-name 1684 38%
- file-name-case-insensitive-p 1250 28%
+ tramp-autoload-file-name-handler 1172 26%
+ tramp-file-name-handler 78 1%
((rst-mode . ((fill-column . 80)))
(sh-mode . ((sh-basic-offset . 2))))