Hi
What about using systematically:
* pngcrush or optipng for PNGs
* jpegoptim for JPEGs
PNG optimizers may be very slow, but it's possible to get relatively quickly
a good optimization, and jpegoptim is fast.
With this methods, it would be relatively easy to reduce the pictures size
about 10% - 20% the image sizes.
Such optimization would directly impact the bandwith usage.
Emmanuel
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