In the current Postman desktop version, you can run collection with the performance tool. Is this something that is also supported in newman as well?
The performance testing features are quite new, and work with the new CLI.
I don’t think it will ever be supported in Newman, but that is something that Postman will need to confirm.
As an alternative, I would recommend JMeter as its sole purpose in life is performance testing.
Do you know if the postman CLI has the same limitation of 25 collections per month run?
Yes, I think the limits apply to the Postman CLI, but not to Newman.
The performance features you are using in the UI are not currently part of the Postman CLI, you could run the same Collection through the CLI but you wouldn’t be able to configure this as a performance testing run.
There are no limits to the runs via the CLI but as you would be using your Postman API Token to access and run the Collection, the usage would count towards your monthly allowance.