I really hope Canonical doesn't intend to release a quad core Cortex A15 Ubuntu tablet with even the slightest lag or stuttering. I'd rather they delay it for months until they fix that, instead of releasing it like that. People are not going to take that for tablets anymore, and not with today's hardware.

From what I read somewhere, Ubuntu for phones was pretty CPU intensive, which could mean it didn't have hardware acceleration. I did notice some stutters when switching between apps in their own video. So that better not be happening when they actually release the devices, or people aren't going to give it a second thought.

In Ubuntu mobile's case, the first impression will literally decide whether Ubuntu has a future in mobile or not. So they better make sure everything is absolutely flawless, instead of hurrying up to ship it. If Ubuntu for phones and tablets has the same performance issues as on desktop, then might as well call it a dead-end now.