It's not just tying up threads you want to avoid but any unreasonable resource consumption you can. You maybe for example want to make sure the delay timeout y

It's not just tying up threads you want to avoid but any unreasonable resource consumption you can. You maybe for example want to make sure the delay timeout you store for that account (by comparing current time to a "notBefore" timestamp or what not) is not going to cause a DB lookup each time, etc.