Are you one of those who have problem with WP Smush it plugin? Suddenly it doesn't seem to work anymore. Forget about
WP Smush it. Delete it away and get another plugin which can do the same job.
It is called
EWWW Image Optimizer. This plugin automatically compresses images when you upload them. It can do bulk optimization. And it is completely compatible with new version of
WordPress.
Get EWWW Image Optimizer at:
http://wordpress.org/extend/plugins/ewww-image-optimizer/
Here is another image optimizing plugin
called CWImage Optimizer over at
: http://wordpress.org/extend/plugins/cw-image-optimizer/