Three years ago, when I was asked to implement a DocumentCache class in the cinlib, I made a mistake so that first build that had it was actually horribly slower than before it was implemented. Yes, I admit it. But I fixed that problem in the very next build, and it actually did end up being a net gain.
So is it really fucking necessary that every time since then when there the slightest question about cinlib performance, the first words out of your mouth are “can we try disabliing the DocumentCache to see if that fixes it”? I mean, it’s been three years. Give it up, already.