That's complete bull from Samsung. They're own problem that they put touchwiz on the phone, and the default interface of ICS is much better. Poor, poor excuse.
Yes we have less ram, but why is it working 98% perfect on my phone already?
Sent from my lag free CM7-nightly'd-up Galaxy S using the XDA Premium app
Samsung Galaxy S3 - CM10.2 - Googy.
Nexus 7 - 4.4 AOKP - Stock