But, all things considered I'd rather Somebody Else (because Somebody Else makes browsers, I don't) spend developer time making a fast system secure rather than running a slightly more secure system up against the hard walls imposed by any managed language one would care to name.

No, I don't think they're straightforward to avoid.

I think it seems straightforward to avoid memory lifecycle bugs because it's straightforward to avoid them under normal operating conditions. But attackers don't honor normal conditions; they deliberately force programs into states where events are happening in unexpected ordering and frequency.

I don't even know where to begin with the idea that it's acceptable to sacrifice a couple memory corruption vulnerabilities in the service of a faster browser.

Fair enough, and you certainly have more experience on the topic than I do. Thanks for the explanation.

One quibble though, and maybe it was poor phrasing on my part:

> I don't even know where to begin with the idea that it's acceptable to sacrifice a couple memory corruption vulnerabilities in the service of a faster browser.

It's not really an either/or though, right? I mean, you can protect against some forms of attacks through a managed environment (though the environment itself adds its own attack surface). But you trade performance to get it. A managed language isn't going to solve all your problems, and it is going to mess with your performance in inconsistent and essentially intractable ways. I'm not saying "throw in a couple memory corruption vulnerabilities if it'll make it faster", I'm saying that you can fix memory corruption vulnerabilities. You can't fix inherently slow.