I’m noodling away at my websites performance using the Google Page Speed plugin.
It recommends losslessly compressing your images using a number of utilities.
I mostly upload png format images so I ran the following on my WordPress content folder to compress the images.
# install both the jpegtran and optipng compression tools apt-get install libjpeg-progs apt-get install optipng # change to your wordpress content directory cd /path/to/your/wordpress/wp-content # run a command to find and compress all your png's # this will take a while if you have been blogging a lot of images find . -type f -name *.png | xargs -IFILE optipng FILE # clear your browser cache and rerun Page Speed # to see if you have made an improvement. # (I went from 90 to 91 on my page speed rank)