HP tested webOS on an iPad 2
The Next Web reports that, "the hardware reportedly stopped the team from innovating beyond certain points because it was slow and imposed constraints, which was highlighted when webOS was loaded on to Apple’s iPad device and found to run the platform significantly faster than the device for which it was originally developed."
I actually wonder how they did this. Other websites have mentioned that they made a web app version of webOS that simply ran inside Safari. Is that really testing the performance of webOS? (And if they did create that... I want my hands on it!)
It doesn't surprise me that these apps would perform better on the iPad, because HP/Palm hasn't finished implementing full hardware acceleration in webOS 3.0. All of the CSS animations and slick UI effects would be much smoother in Safari.