6.29When NOT to parallelize this example

Suppose Opportunity creation requires:

credit decision

Then these cannot happen simultaneously:

Credit API
Opportunity creation

because one depends on the other.

You need:

Credit API
   ↓
Choice
   ↓
Opportunity

not:

Scatter-Gather
Credit + Opportunity

Rule:

Parallelize only operations without required ordering/dependencies.

Simple but important.