There are many ways to minify the size of a website. First is to obviously minify the files themselves. Then comes database consolidation/clean-up, JS request minimaization, image optimization, etc.
These techniques have been studied for decades by industry experts like Steve Souders and they are easily repeatable if you take the time to learn.
A new guide titled How To Lose Weight(in the browser) includes all the pertinent info you need. Website performance really is important, so how you handle that stage of development will play a crucial role on the visitor’s end.
Take a peek at the homepage and see if it can help you. There’s no doubt that performance is a vital part of web design – the only question is how much effort will you put into that area?