BC Service Tier CPU usage

AK

Hi,

is the service tier of BC 14.0.38650.0 on premise only able to use a single core? I know previous versions like NAV 2017 were using multiple cores.

We as a end user have some performance issues and our partner blames the service tier by refering to https://docs.microsoft.com/en-us/dynamics365/business-central/dev-itpro/performance/performance-onprem#scaling, where it says "AL execution is single-threaded until the Business Central 2019 release wave 2".
We are developing in C/AL, and as I understand, in our version AL might only be used for extensions, right? Or is our version already using AL internally and so limiting the service tier to just one core?

Thanks!