As always depends on what you are doing. I have a 13" air (2011) and it just flys. I use it for programming (PHP,nginx,mysql,memcached,...) and some photoshop n

As always depends on what you are doing. I have a 13" air (2011) and it just flys. I use it for programming (PHP,nginx,mysql,memcached,...) and some photoshop now and then (loads so fast I though at first that it was broken:)). The only issue I have with it is that some badly programmed flash on web sites will spin my fan like there's no tomorrow (really loud). Oh that happens when playing games too, but that seems reasonable to me. All in all this is the best computer I have owned or used (and I've never used OSX before). The most surprizing thing was that I came from a 15,4" laptop to a 13" and I don't feel being cramped at all, I can work on my stuff easily, which I wasn't able to do on my old laptop. The resolution is just perfect (at least for me).