Impex Import super slow
 

I am importing from a custom MSSQL based forum using the fusetalk template for reference. The data is importing, but at an extremely slow rate. It currently processes 10 users/min. I have 316,000 users and 13,000,000 posts to import. At this rate it will take me 2 months to import. I tweaked the php memory limit to 1024M and MySQL buffers but it is still slow. The load on the servers is less than .1% so I have resources to spare. Any Help/Guidance is appreciated.