Would 13" rMBP UI Lag be Noticeable?

[hotelspunk33]

So, I'm planning on buying the base model 2015 13" rMBP and I've found many threads about the UI Lag that comes with Yosemite for the 13" rMBP, I was wondering that if I reduced transparency, would you still notice the lag to the point that I should return it? Or would the better option be to just buy a maxed out MBA?
Thanks!!!

 

[Toutou]

There is no lag for most people, just buy the machine you want and IF there's anything wrong with it, seek help (or wait a month for El Capitan).