英汉互译：

As a webmaster you already know how important it is that your web pages download fast. In a nutshell, if your pages are slow, then you're losing visitors. And if you're losing visitors, you're losing money.

网站管理员应该了解提高网页下载速度的重要性，简言之，网页下载速度慢，就会流失网站访问者，也就会流失金钱。

To speed up your download times, most web design experts will suggest that you optimize your GIFs and JPGs so that they download faster. They'll suggest that you make your images smaller or remove them altogether. Or they'll simply suggest that you put less stuff on your pages.

大多数网站设计专家建议优化GIF与JPG图片，以提高下载速度，他们会建议缩小图片尺寸或移除图片，或者建议减少网页内容量。

All of these methods work. The problem, however, is that they all involve doing things that you don't want to do. You don't want to squeeze any more quality and color out of your images. The same goes for your content - you put it there because you want it there. Basically, there's only so far you can go with these approaches before you really start to ruin your page.

这些方法都可取，但问题是你不想采取这些方法。你不希望减少图片颜色，降低图片质量；你不希望减少网页内容，因为它们具有存在价值。如果遵循这些建议，你可能会毁掉整个网页。

Fortunately, there's one way to get your pages opening faster without having to compromise your images or your content. This is a simple and effective method, but one that is rarely discussed by the web design experts.

然而，值得高兴的是，有一种方法可以减少网页下载时间，并且不会改变图片与内容。这种方法简单、有效，但网站设计专家很少提及。

To understand this approach, it's important to recognize the difference between "perceived" download time and "actual" download time. The perceived download time is the time it takes to have enough stuff displayed on your page for the visitor to be able to start studying your content. The actual download time is the time it takes for the entire page and all its contents to be fully downloaded.

了解这种方法之前，首先明确“可感知的下载时间”与“实际下载时间”之间的区别。“可感知的下载时间”是指访问者可以浏览网页内容所需要的下载时间（不必全部下载完毕，内容足够访问者浏览即可）；“实际下载时间”是指网页全部下载完毕所需要的时间。

The perceived download time is the one that really counts. Why? Because once your visitor has something before his/her eyes to read or look at, then there is much less risk that he/she will click away because your page is taking too long to load.

“可感知的下载时间”确实很有价值，因为如果网页下载时间很长，用户可能会在未浏览内容之前，离开网站。