This isn't really a bug report, and should probably be moved to the General Support section.
Not much support can be given for a system that only meets half the minimum system requirements though. To be sure, you are lucky that the game runs at all. (Note to testers/developers, might be a good idea to block the client from loading on systems that don't meet minimum requirements.)
I'd say a resolution no larger than 720p, and all graphic option on low with occultion and texture Streaming turned on may help. You didn't say what kind of a GPU you have in that, but I suppose it's not spectacular.
I must say though, it's very strange to see a setup with a 5th Gen Intel only have 4GB RAM. 8GB is basically the industry standard since the 4th Gen chipsets.
