Getting horrible lag in cities and the world area, with severe lag spikes dropping my fps to under 10. But when i'm in my mog house or on instance servers i get 60+ FPS.
My System specs are:

Intel(R) Core(TM) i5-2390T CPU @ 2.70GHz
8 GB of Memory
AMD Radeon HD 7800 Series(VRAM 4095 MB)

My graphic card is up to date and my graphic settings are set to low. I don't know what to do at this point. Any help would be appreciate. Thanks

I also ran a benchmark last night and was 11k with 103 average fps, but the actual game cant even hold 30 fps.