The PTR has been a painful success. It is great, and I am grateful for how it keeps growing, but every time we add ten thousand or a hundred thousand new things somewhere, it lags out some bit of UI where I never thought it would be a problem. Anyone who has tried to work with PTR siblings or parents knows what I am talking about--it can take five or ten seconds, every single time, to load the manage tag siblings/parents dialogs. The same is true for anyone who has programmatically imported siblings from a booru--adding 100,000 pairs can be neat, but editing them manually is then a constant frustration.