Purported Windows RT performance Issues, RT based or SoC?

So i must preface this by saying i have never used a windows RT device for more than 15 before i get kicked out of the store.

But all the performance issues of Windows RT , do you guys reckon it stems from the fact that RT is so young and inherently has problems or because its becasue they use Tegra 3 which is inherently bad or Snapdragon S4 dual-core which just doesnt have all the horsepower needed to run RT

for some reason im thinking its more of a chipset issue, but i cold be wrong, whatdo you guys think?