Compress pictures for smaller file size and faster loading.

压缩图片以获得更小的文件和更快的加载速度。

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Use an image with a smaller file size (usually fewer colors) than the main image so it loads faster.

使用一个文件尺寸比主图象更小(通常颜色也更少)的图象，可以提高装入速度。

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Improvement on GIF, with smaller file size, millions of colors, transparency, and compression without loss of detail.

对GIF进行了改进，文件更小，数百万种颜色，透明，不丢失细节的压缩。

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Microblog content is usually smaller in both file size (with many photos requiring you click them to see the full size) and content with just a few sentences written up instead of the longer format of blog posts favored by Blogger and WordPress, its powerhouse blogging competitors.

FORBES: Tumblr 101: Join The Reblogging Group