How to improve pagespeed ?

Hi Jejemo!

– caching is one of many aspects to look at:
there is a plugin used such as w3 total cache: http://www.w3-edge.com/wordpress-plugins/w3-total-cache/

-if u hav many pictures or images on your page of relatively large sizes you may have to compress them and save up to 80% space on those images without perceived quality decrease. FileMinimizer: http://www.balesio.com/fileminimizerpictures/eng/index.php
I use the free trial version.

of course there are other aspects which I am sure others will point to (amount of external javascript, plugins used…)