在显示页面之前运行脚本

I've built a site that does a bunch of calculations as the page loads (basically it determines the users screen size, then assigns all of the page images sizes and positions and applies them). The problem I am having is on a slower connection, this is visible (all of the images will start in the corner, then resize and reposition). This isn't a huge deal, but it's kind of an eyesore.I've built a site that does a bunch of calculat