I use Keyclone not Octopus so I can't really speak to your specifics, but:

Lower ingame settings?
Sound disabled on follower?
Can you adjust FPS with octopus? (i honestly have no clue)
Running 2 accts from same folder or seperate folders?
Seems like a satisfactory cpu, borderline ram, but what about vid card?

I am definitely no tech-guru, especially compared to others here but those are the first things that pop into my head.