I'm working on a single page application that heavily utilizes IndexedDB. While feature detection can tell the presence of it, it tells nothing about the qualit

I'm working on a single page application that heavily utilizes IndexedDB. While feature detection can tell the presence of it, it tells nothing about the quality of the implementation. For example, in Safari, inserting ~9k rows takes 10 minutes, and IE doesn't support compound key path. While it's possible to write custom logic to detect the latter, it's impossible to detect the former cheaply and reliably. I guess I have to resort to UA sniffing.