these minimums should be used as a guide only - individual system differences such as motherboard differences, cpu bus speed, hard disk transfer speeds, drive controller cpu utilization, background services and applications, operating system utilization and various other factors will make your individual results vary.
for example, "single filter in real-time" specifies the minimum system speed required to play clips with a single filter applied.
this does not mean that you can only have one clip on the timeline, or only use filter within the entire timeline. this just means that at any single point in time on the timeline, there is only one clip with one filter on it. there can be other clips at that point in time on the timeline, but they cannot have filters applied to them.
a simple example: clip a has picture-in-picture applied to it and is playing over clip b which has motion blur applied to it. this would be a case of two filters - one on clip a (picture in-picture) and one on clip b (motion blur).
a slightly more complex example: clip a has emboss applied to it, clip b has motion blur applied to it, and there is a transition between them. now there are three effects happening at one time - emboss on clip a, motion blur on clip b, and the transition between them.
a final complex example: clip a has emboss applied to it, clip b has pencil sketch and motion blur applied to it, there is a transition between clip a and clip b, and clip c has picture in-picture applied to it. now there are five effects happening at one time - emboss on clip a, motion blur and pencil sketch on clip b, the transition between a and b, and the picture-in-picture on clip c.
