TempDB Configuration using 8 TempDB Data File
Check these articles for some recommendation.

https://cloudblogs.microsoft.com/dynamics365/no-audience/2015/09/25/ax-performance-analyzing-key-sql-server-configuration-and-database-settings/

https://docs.microsoft.com/en-us/dynamicsax-2012/appuser-itpro/configure-sql-server-and-storage-settings

Also, you could check for tempdb auto grow events, if there are, you could enable IFI, also check if Lock Pages in Memory is enabled.