Working with Rails for some time you start nitpicking on how to improve it. This is a first in the series of articles regarding on how to improve (even marginally) Rails's performance.
I'll focus on a bunch of gems that speed up, in some cases considerably, small parts of Rails, like the html escaping, the String#bla ...
Ruby 2.1 was released this Christmas, great news everyone! It sports a better GC (RGenGC - gerational GC), hierarchical method caching, some small syntax changes and non-experimental rafinements. All in all one can expect 5% to 15% performance increase which is quite awesome.
As I was reading the comments in the hack ...