>Still, I don't have experience with iOS devices, but my Nexus S tends to be so laggy at times that apps crash frequently.

This sounds more like poorly written apps than an issue from the article.

For example if you are scrolling a list view and it slows down to the point of crashing, the application probably isn't caching views or has a memory leak (application authors fault).

If your device gets sluggish and you get miscellaneous force closes I would look for applications with background services that are doing more work than they should be.