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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Arranging the images in the Sprite horizontally as opposed to vertically usually results in a smaller file size.

安排中水平相对于垂直通常较小的文件大小中的结果Sprite图像。

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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