You can also do the following:

Slice it, export it to html, but don’t use that html as a final one.

Edit it in a Dreamweaver. Where you have a larger surfaces use CSS background repeat behavior to decrease page size, instead of full images.

Example: You have a blue box sized 200 x 200 px. Cut that image to 200 x 2 px and use repeat behavior with your CSS file.

Also, instead of doing text in a Photoshop, type it in a Dreamweaver whenever is possible.

If you need more help, contact me