I had to check some of this before responding.
"... there are fast repititons where the repititions are actually recorded, rather then round robin programming."
Yes. Load a fast-rep patch, and in the Advanced View, you'll see only one version of the sample (one red dot). By the way, a few of the older libraries also have one and two upbeat samples.
"There are so called PERF REPITITION patches which ahve cresc and decresc patches."
Perf-Repetition patches come in two varieties: dyn5/9 *and* regular (non-dynamic) repetitions.
"And then many other normal patches throughout VI are also using the Repititions Control, but without any cresc or decresc programming..to avoid round robin artifacts."
Yes. There are short and long notes with more than one alternative sample. They often have four options if you include the initial note (designated with the 1 in a circle). They're not designated with "perf" anything, but they still have round robin options.
Note as well that to deflect the machine gun effect, alternating tuning curves which can be triggered per note further obscure any sense of a repeated sample.