For those of you who are having shuttering issues while playing BF4, with Intel I7 Cpus try this fix. It has to due with un-parking idled cores. Some others have tested it and had really good results.
Cut and pastE this link, the download link is at the bottom after the how to screen shots.
The link says: (Near bottom of page)
Pease download files below:
**Download application executable files ... <===Click this on page
Download file, then extract, open folder labeled Unpark-CPU-App, click Item labeled: UnparkCPU, a window will come up, click check status(it will take a second, then it will show your parked cores, click unpark all, and Run and Check your performance in BF4.
So far we have seen decent results with 2 I7 cpus and 1 AMD 8 core, so it works with both apparently, but results may vary.