This probably doesn't have much to do with this problem, but I am running Bitcoin Core on a laptop with 8GB of ram and Windows 8.1 OS. It took me 6 days to install the software. I mean that program installed quickly, but it took 6 days for it to complete synchronization. During this period of time, the so call "Stress Test" was going on and in my opinion had a lot to do with the slow synchronization. Doesn't ad much to this problem, but though you would appreciate the info. The version was 0.10.2 and running v0.11.
It is quite unusual for it to take 6 days. Recent software should sync much faster than this. Actually syncing is mostly dependent on your internet connection and your HDD/SSD speeds (overall stronger PC configuration helps) as far as I know. I don't think that the stress test would cause this as within that time I had no problems nor delays while syncing my own wallet.
There isn't much that I can exactly tell you since I have (had) no access to any data. Usually I analyze the connection when synchronizing.
May I ask, what the CPU is and if your laptop has a HDD or a SSD?