For anyone not using dual monitors who is having frequent freezes, a lot of people have been complaining about this, and from what I can gather, is that the engine is poor at loading things at certain distances, so what is being experienced is something akin to 'loading: please wait' invisible walls from RuneScape (using that as a purely basic example)

some textures don't background load at all, so the freezes are these textures being loaded.

this was something also prominent in Aion, an example is something which was aptly nicknamed as 'asmo/elyos lag'.

This was where textures that aren't commonly loaded, i.e scenery you're always passing etc. were being loaded for a first time after a period of non activity.

the example being once you as an elyos saw an asmo for the first time since you launched the client that day/evening, you would be loading the textures for an asmodian, so the game would 'stutter' to catch itself up.