Dan's point about being aware of the different levels of inequality in the world is something I strongly agree with, but that should also include the middle-income countries, especially in Latin America and Southeast Asia. For example, a user with a data plan with a monthly limit in the single-digit GBs, and a RAM/CPU profile resembling a decade-old US flagship. That's good enough to use Discourse at all, but the experience will probably be on the unpleasantly slow side. I believe it's primarily this category of user that accounts for Dan's observation that incremental improvements in CPU/RAM/disk measurably improve engagement.

As for users with the lowest-end devices like the Itel P32, Dan's chart seems to prove that no amount of incremental optimization would benefit them. The only thing that might is a wholesale different client architecture that sacrifices features and polish to provide the slimmest code possible. That is, an alternate "lite/basic" mode. Unfortunately, this style of approach has rarely proved successful: the empathy problem returns in a different guise, as US-based developers often make the wrong decisions on which features/polish are essential to keep versus discarded for performance reasons.