Do I need to upgrade to Quantum by Sage?

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Hi everyone,  I wanted to get a little info before I make my decision on upgrading from Sage 50 Premium to Quantum by Sage.

Currently I am using Sage 50 Premium Accounting 2015 hosted on a single workstation computer, and a second computer that accesses the company data over the network.  Nothing big, simple workgroup setup with network shares.  Everything works great on the hosting computer.  I can access data, create reports, and process checks extremely fast.  This is not the case on the second computer.  Some tasks that take seconds on the hosting computer takes minutes on the second computer. 

Now, I worked with the sage support team and they are telling me that I should upgrade to Quantum by Sage.  I would have no issue with doing this, but they cant assure me that this will solve my issue.  This is a big deal for me, as this is going to be a pretty large investment to "Maybe" solve my issue.  The reason I am being told to upgrade is because my company file is too large for Sage 50 Premium Accounting and would be better handled in Quantum by Sage.  As of writing this my company file is 410MB. 

Any advice or opinions would be greatly appreciated.