Thanks Luis,
I took a look and you’re doing pretty well time wise so far. I’ve attached a screenshot of the loading time that I recorded from Pingdom which was 1.16 seconds.
What I would do to speed things up instead of splitting the images is this. Create your images. Once you have them as you like them, run them through http://www.smushit.com/ysmush.it/ to make them as small as possible.
Then when you have that finished, install the WP Super Cache plugin. This plugin will reduce the load on your database by remembering what information was pulled so that every visit doesn’t make a trip to the database for the same information. That speeds up the page generation.
It also has the ability to compress your content which will speed up the loading of your images and other content too by making the size smaller.
Give those things a try and that should speed up your site, especially as you add in more content.
Let me know if you have trouble,
Bill