Search speed will increase or not if you use:
- HDD, SSD, M.2 or DDR vertual disk?
-32 cores or 64 processor cores?
HDD speed doesn't matters.
If you using CPU then more cores => more threads => more speed.
We are talking about multithreading or we need to run 64 commands?
For example, Brainflayer works only on one core.
There is no need to run 64 different instances of Kangaroo at once, use the -t <number of threads> option to launch that many worker threads.
I wouldn't run Kangaroo on a virtual disk because of the overhead of running programs inside a VM, but since Kangaroo isn't a disk intensive program it doesn't matter which disk you run it on.