Too fully take advantage of optiminer's improvements you need a modern cpu that supports aes and avx2. For me on a E3-1240 i managed to double the hashrate with it. ( using 4 cores , on ubuntu 14.04 )
In your case using 2 cores yields more hash, the higher the combined hashrate the better. ( i assume you have an old dual core cpu )
What hashrate do you get with your E3-1240 on linux and how do you make a benchmark? I use the same CPU with Win10 and when the miner is running it shows between 400H/s-500H/s in each "accepted" line. No feeling if this is good or bad rate for my CPU.
