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作者肯定不是搞 rails 的，里面很多手工优化都被我们的工具自动解决了...
23: slim
21: sass
20: asset pipeline
19: sass 可以 inline @import
18: jquery $.getScript()
17: 没必要，现在的 js engine 都会优化 array.length
13: asset pipeline
12: asset pipeline
10: coffee
8: sass
7: sass
6: image_tag helper
4: asset pipeline 做得更完善。还在用 apache?
3: nginx 还有 gzip_static
