Hi @guy038 ,
to your question about the 8 logical processors: they don’t really matter here. The load threads do very little computing, they mostly wait for the key to deliver the next file. How many reads can usefully run at once depends on the drive, not on the CPU. That’s why auto picks the count by drive type: 4 for local drives like your key, 8 for network drives, where every file waits for the server, and 1 for hard disks, where parallel reads would just make the heads jump back and forth. On a key with a weaker controller, 8 could just as well be slower than 4. On yours it’s slightly faster, so feel free to keep it. 8 is also the maximum.
One more thing: your first comparison showed 27 053 hits in the same 646 files, now it’s 27 010. Did anything change on the key in between?