Hi all sifu,

i m using MBA 2014 When i doing upgrade to OSX Yosemite is asking add in File vault? so should i add in?
another thing about wifi issue so far still stable but the only thing i found out is battery drain fast because usually when i watch movie 8 or 9 minute will using 1% battery (internal not using external hard disk) but after i upgrade it, result showing every 4 or 5 minute battery will drain 1%. is it a normal issue for every mac user here?