It looks likely that Apple's iOS 5 will will address an issue that deprived some Web apps from a speed boost that came to the mobile version of Safari.
It appears iOS 5 could address this issue, though.
"Did they fix the bug from 4.3 where home screen Web apps don't use Nitro?" asked user MatthewPhillips on Hacker News yesterday. The reply from Xuzz: "This is probably breaking my NDA to say this, but yes, they did. Web.app now has the 'dynamic-codesigning' entitlement, which enables Nitro."
There's also a way to create Web apps on iOS that doesn't use Safari proper, an interface called UIWebView.
"They don't [get Nitro benefits], but that's a security restriction," Xuzz said. "They can't give dynamic-codesigning to all apps, or their security (which that disables, as a requirement to enable the JIT) would then be useless."
Apple didn't immediately respond to a request for comment.