In reality for the vast majority of apps you'll never notice the limit. By far the most effective thing to use for (hardware accelerated) smooth animation are CSS transitions which run at normal speed like safari.
The only circumstance where missing JIT support for the webview would come into play would be with games, and even here there is plenty of room for performance (check out impactJS)
The only circumstance where missing JIT support for the webview would come into play would be with games, and even here there is plenty of room for performance (check out impactJS)