I've been running Koush's builds of ICS on my Nexus S, and I honestly feel like it runs faster than Gingerbread/CM7 did before. The biggest factor is that ICS

I've been running Koush's builds of ICS on my Nexus S, and I honestly feel like it runs faster than Gingerbread/CM7 did before. The biggest factor is that ICS responds so much more quickly/sensitvely to touch movements than Gingerbread or Honeycomb did, and that goes a very long way to making the entire experience feel smoother and more responsive. Between that and the new interaction features in ICS, I'm never going back to Gingerbread on my phone again, and I'll be flashing ICS on my tablet as soon as someone releases a stable build for it. It really is phenomenally better than previous versions of Android, hands down.