How much does NACM affect NSO performance?

[Mark Swanborough]

If I have a lot of complex NACM rules, how do they affect performance? Are they evaluated on every read/write?

[Jan Lindblad · Accepted solution]

Yes, basically NACM rules are evaluated for every read/write, so they can have a huge impact on performance. The NACM system is reasonably smart, however, and builds up a decision tree out of the rules at session start. So if multiple rules have the same condition, it may not need to be evaluated for each rule.