wotlk

hi i have a old system for casual online gaming like wow:wotlk (2008) and dota 2 with this specs Q8300 6gb ram 1030GT in game usage CPU:30-40% GPU: 30-40% ram: 3 GB out of 6 GB yet i have a fps problem and i get 15-28 FPS with everything max in Video settings is this a bottleneck? how can i...