Are Client and UserEvent scripts not part of the concurrency calculations?

if you mean Web Services and RESTlet Concurrency Governance, then no

I mean whatever the counter is that includes map/reduce and scheduled scripts. It seems like I have in my system an incentive/opportunity to use CS/UE scripts in place of some MR scripts, where possible.

the answer is still no if you mean SuiteCloud Processors

Ah, ya, that's the one. Thank you. Arg

beware user event script, their performance cost is paid at the time the record is saved

Yes, thank you. I'm trying to keep us under the standard limit of 5 concurrent requests because I can't stand how pay to play netsuite is.

to a lesser degree client scripts as well, but there tends to be more time to do things in the user interface when an actual human is doing things

Ya, I'm seeing that, thank you for confirming, we're just getting high pressure sales calls about upgrading because we're over the concurrency limit 1 minute in an hour.

architecturally, moving a bunch of logic from backend scripts to client scripts is probably not ideal.

I think I'm just going to get smarter with our schedules and push some things to 3am and slow down other things

it sounds like you have suitecloud plus, so you may be able to take advantage of the more advanced features like Priority Levels, Priority Elevation and Processor Reservation