What do you mean it's "faster"? Are you saying you can get more polyphony? Because it's SLOWER by a LOT to load more buffers into more RAM. I've not noticed any difference in polyphony. 100% of notes you play on a disc streaming instrument will stream from the storage, no matter what buffer size in kilobytes is specified. Unless you turn the disk streaming OFF, that is...
OP: Mine (v6) is set on 6k. The samples are on a combo of SATA SSD and nVME.
I'm not doing "composition" with 900 disabled instruments in a template, so...YMMV.