Performance degradation on Map data type with 30 keys

Hello,

I'm looking to leverage map datatype profile attribute to assign offer priority dynamically in AJO Ranking Formula, however, on the documentation it says that map cannot exceed 16 keys or else risking performance degradation.

I was able to ingest records with 30 keys, so this is not a hard guardrail.

My question is, is this performance degradation linear or exponential?
How will the performance differ from using map vs 30 if statements in AJO Ranking Formula?

Thank you.