I didn't even know you could do that now.

That could definitely cause this problem. It would've been a number closer to 2400, since that's close to how many usernotes oddler has. It makes sense that it would take higher than 32MB (especially if they're image-heavy), since the server has to hold the whole lot in memory.

A 100-post page in a thread can chew up a good 5-6MB of RAM easily.