Unusably laggy no matter what instance you use.

It’s easy on Reddit because they have their own username generator when you sign up, but the usernames being used here are very telling. Random letters is literally the absolute bare minimum effort for randomly generating usernames. A competent software engineer could make something substantially better in an afternoon and I feel like an adversarial nation-state would be using something like a small language model trained solely on large lists of scraped usernames.