If your tempdb is on separate disks, then use it as much as possible.

You can also add some files each with equal size and equal auto-growth, and it will alleviate possibly existing allocation contention.

Well configured tempdb brings performance gains.

If you read and understand http://technet.microsoft.com/en-us/library/ms345368(v=sql.105).aspx and https://www.simple-talk.com/sql/database-administration/optimizing-tempdb-configuration-with-sql-server-2012-extended-events/

you'll see the big benefit of a well configured tempdb

Regards,

Igor