UCI setup Rechenschieber in Chessbase engine cloud

[compchess]

Hello! Rechenschieber in the chessbase engine cloud uses half as many cores/threads as the computer physically has, and it still has good speed. How does it do this, and what are the stockfish settings? I've tried configuring affinity for physical threads using lasso, and I've tried different thread configurations, but on a 7950x, 31 threads in chessbase are significantly faster in terms of speed and solving test positions than any combination of 16 threads. How does it do this? I've been searching for a discussion about something like this, but I haven't found anything similar, although there is information that Rechenschieber (Lukas Cimiotti) is available here. The description of the stockfish states that the more streams for modern stockfish, the better, but Lukas Cimiotti is a renowned professional in his field, and he wouldn't just randomly use 64 threads per engine on a 3990x instead of the available 128.