I gave a lightning talk at SydJS in October about the difference between FastClick and FastActive. The demo gods were unkind and none of my demos worked on the night (a last-second refactor broke them).
I've improved the demos since then — try them out with your touch device of choice.
The essential difference is:
- FastClick is 8KB and reduces the actual delay when tapping a link
- FastActive is 0.45KB and instead reduces the perceived delay
Both solutions have their pros and cons. I'm going to stick with FastClick on my blog because the server hardware backing it (Amazon S3 + CloudFront) is fast enough to notice the difference. If, however, I was working on a project which wasn't just static content being loaded from a CDN, I'd definitely be weighing my options.