Well, seems like I had to say that LabVIEW also should behave as RTE does, but it does not for some obscure reason. So, my bad in phrasing there. It's not so easy to answer, not knowing how Vision internals work. I suppose, it has something to do with the way, how Vision's memory manager allocates memory. Perhaps it's more optimized to work in LabVIEW and less (or not) optimized for EXE's. I noticed that in IDE IMAQ Create takes nearly the same amount of time to run (0,03 to 0,06 ms), while in RTE that amount starts at 0,03 and raises on each iteration. Here are the shots to illustrate.
IDE:
RTE:
Maybe someone from NI could elaborate on these differences?.. By the way, I found two more similar issues [1, 2] and the reason behind each one was not clarified.