Comment by rachelbythebay

What does the business need?

What can the service deliver?

If you need it faster than it can deliver... then setting your timeouts/paging/whatever to that point will just bring you pain and suffering.

I think you'll find a lot of people just say "what's p99 right now", add a little to it so "it won't page me", and leave it there.

Actually driving down p99... is not nearly common enough.