[hutattedonmyarm]

Hm, I never had issues with that. Maybe if you use Chrome since that runs pretty terrible on OS X, but otherwise no issues. OS X tries to keep your memory pretty full, since there is no point in having a bunch of memory if you don't use it.

[pjmlp]

When used Mac OS X for an iOS project, it was hardly an issue, just something I happen to see sometimes being posted, not sure how serious it really is.

Otherwise I spend my time in other systems anyway, so I cannot properly judge it.

[hutattedonmyarm]

Maybe if you only have 4GB it could become an issue, though my dads MBA runs just fine with it