> This is why UUID-based systems can suffer worse read + write performance; their rows will be stored in the order of its UUIDs (that is, randomly spread around

> This is why UUID-based systems can suffer worse read + write performance; their rows will be stored in the order of its UUIDs (that is, randomly spread around), making read, insert, and update performance lower. This isn't always the case anymore. UUID standards have been developed in that mind, and they are not completely random anymore. UUIDs can give a hint, for example, about the time when it was created, which gives them some order.