Anyone who spent time in Second Life would know that user-generated worlds are terrible for graphical performance, because people want to stick in as much content as possible and don’t approach it in the same methodical way as a game designer would.

So in SL that gets you sims with 3 fps on a good graphics card, and people who are greyed out because their clothing complexity exceeds your graphics limits. Now imagine wearing that 3fps glitchiness in a VR headset.