Thanks for the feedback, there are a few challenges around this - we need to get it order ASAP. We've had a few performance-only hack days, and have another one

Thanks for the feedback, there are a few challenges around this - we need to get it order ASAP. We've had a few performance-only hack days, and have another one this weekend. It'd probably be work a blog post talking about some of the challenges around eeking out performance in places where you're not accounted for (as an extension, for example), and some ways to work around it - once we've fixed it, of course!