SEP 12.1 in BE2010 R3 media server

I have run BE2010 without SEP because the issues I had with it. Now I decided to give another go for it, but unfortunately no improvement has happened. After installing SEP 12.1.1101.401. When backing up to deduplication folder job rates decreased from 825MB/sec to around 200-300MB/sec. I have created following folder exceptions:

- Deduplication folders

- BE installation folder

- MS SQL

- B2D folder

Is there something else that needs to be done? BE version is 2010 R3 SP2.