Vulture writing critical hardware graphics have long used images per second to measure performance. The thing is, a large number of frames are generated in one second.

Calculating the SPF may mask brief moments of stuttering noticeable that only a closer examination of individual frame time can be quantified. This article explores the topic in much more detail. Along the way, it also illustrates effectively micro-stuttering attributed to multi-GPU solutions like SLI and CrossFire.

AMD and Nvidia two concede that stuttering is a real problem for modern graphics cards, and methods of analysis may need to change well into account.