You said you didn't have problems now but data is growing and you want partitioning to make things faster. I submit that you, like SOOO many others that have tried to go down the table partitioning road for such a reason, simply need to TUNE WHAT YOU HAVE (schema, indexing, maintenance practices, hardware, SQL Server, windows, IO subsystem, code, etc, etc) and then you will have ZERO "need" for partitioning!!! 😎

Now, if you are trying to run 1TB+ of data on a $5000 server you may also need "bigger hardware", but that is a simple and cheap thing to deal with if it is really required. But that should only be considered AFTER you have done the tuning.