I was profiling some code a while ago that makes extensive use of boost::variant and one of the lessons from the profiler run was that boost variants appear to be fairly expensive to construct and copy.
I was trying to make Windows a little more Emacs-friendly (or was it the other way around?). First step was to enable the emacs server in my .emacs so I could make use of Emacs for quick and dirty editing tasks that require an editor better than Notepad but where the average Emacs startup time was just a little too long to make Emacs a viable alternative. A typical example would be to use Emacs as the editor for commit messages in Mercurial. A quick tweak of my global .hgrc provided me with an appropriate editor setting:
Happy New Year to all readers.
Long title, I know...
There, I've said it. No tiptoeing around.