Poor Compound Subset Performance

[hyoklee]

Triggered by: #5558

Test code: https://github.com/hyoklee/hpf/blob/1.0.0/src/cmpd_subset.c
Task specific on CentOS5 (Jam):

Test code: https://github.com/hyoklee/hpf/blob/main/src/cmpd_subset.cpp
Overall on Ubuntu-24.04 (GitHub Action):

Overall on Windows-2022 (GitHub Action):