Done some more investigations to find cause using grep ^ *. So far only looked over /proc/sys/kernel and vm, but I can't see anything that would really affect this. Seems odd it only affects moc but not gcc considering the amount of work done by the compiler.

kernel:
msgmni:1718 was 1719
sched_rr_timeslice_ms:30 (new)
threads-max:32132 was 32134
other changes are random entropy

vm:
min_free_kbytes:43580 was 44800
vdso_enabled 1 was 0 and now set to 0