The official forums don't actually use vibe.d. vibe has the most marketing out of the D web frameworks, followed by hunt, but there's actually a few more too that just don't get as much attention, despite being older and possibly more widely used behind the scenes! The official forum uses the `ae` library. (And I have to mention my own `arsd` library which I'm pretty sure is the oldest web lib - mine dates back to 2008, but ae's pretty old too so he might beat me, and mine actually does better on some benchmarks despite me using GC and such with wild abandon.)

That said though, yeah, I don't think any of them use `@nogc`. I've actually tried to get the gc to interrupt audio code before and couldn't even hear it. I'm sure a bigger heap to scan might cause a problem in some situations, but these fears are really overblown in the popular commentariat.