My understanding of how P7 handles texture files is as follows:

1. it copies all texture files used into a temporary directory that you, the user have defined
2. it figures out what resolution you're rendering at and resamples the texture files as required on the fly

I haven't figured out whether temporary files are created for each texture on disk, or whether it's stored in RAM, but I'm guessing the latter.

I'm also guessing that textures are resampled for the Pose Room and held in RAM: the only reason to do any batch resampling would be if your PC or Mac was really  really old  and couldn't handle a 4000x4000 jpeg.

I used to routinely downsample texture files when using P5 and P6 - this just isn't necessary with P7 and a halfway decent, younger than 3 years old computer.

---

Windows 10 x64 Pro - Intel Xeon E5450 @ 3.00GHz (x2)

PoserPro 11 - Units: Metres

Adobe CC 2017