How is 30% not significant?
30% is a bigger difference than most things get between a 2500k and a 4570k. I'd say that's pretty significant and could certainly hold off an upgrade.
Granted, it's not going to be 30% for everything, in fact, it won't be 30% for many things at all, but for the applications that do get near that type of scaling, and with Intel's current generational improvements, that's easily a couple generations wroth of performance for $100
30% is a bigger difference than most things get between a 2500k and a 4570k. I'd say that's pretty significant and could certainly hold off an upgrade.
Granted, it's not going to be 30% for everything, in fact, it won't be 30% for many things at all, but for the applications that do get near that type of scaling, and with Intel's current generational improvements, that's easily a couple generations wroth of performance for $100