Could you expand on what you see as the bloat? I find the base distribution of CakePHP to be very lean, and using it on half dozen production projects, I have found no issues with speed, especially with proper use of memcached and media compression.
this and similar reports from others are the reason i don't use cake, though, and it seems like it would be in their best interest to get some newer information out there. (i made my choices years ago though)
Take with a grain of salt.
EDIT: yeah, pretty sure the original Yii benchmark is dated as the graph has older versions while the phpmark repo has slighlty newer ones ( http://code.google.com/p/phpmark/source/browse/#svn/trunk )