Today I played again with one 2.3 GHZ at the store in the Stanford Shopping Center.
I just tested the lag thing, here are my findings:
Model: 2.3 ghz, 8GB RAM, 256 GB Solid State
Geekbench: ~11k
Ok, first of all I tried two resolutions the maximum space one, and the 'best for retina'.
I didn't see any software update available, but it could be due to the store not having made the update available ( I heard those are managed in-store )
The lag was TERRIBLE, It was awful, seriously.
Safari: Terrible lag, the worst part was when you reached the end of a page while scrolling to see the bar bounce, terrible. In both resolutions it was very very bad.
I noticed that the OS didn't handle windows resizing very well... sometimes it appeared to get confused. Dynamic window resizing was also laggy.
Chrome Canary: It was much better than safari, and I went into the advanced settings ( I think it's config:flags or something ? ) and enabled all the GPU acceleration that I could. It was much much better, and I was even happy about it ( they don't seem to add that bounce effect that safari adds ). ( no lag at both resolutions )
iTunes:
On a window full of album pictures the lag was horrible
iTerm2:
Scrolling on this app, which I use 24/7 * 365 days a year was also a nightmare.
Overall I really feel it's more of a software issue, I tested all with discrete graphics, and I'm quite disappointed. I already ordered one, and I preffer it due to the weight loss and better screen for coding, but yeah, it's laggy.
I hope the software update fixes this
