This artice supports that conclusion.
I myself can say that I am part of that 94%. My computer's performance, even for being only a bit over 2 years old, is shallow. Minecraft lags terribly (I use Optifine at all absolute low settings, with an x8 texture packs), getting around the computer is choppy, and youtube videos, even on SD, experiences heavy frame skips. I know that most of my problems are GPU related, but seriously, computer companies should put their absolute insane profits aside and give us something we can depend on.