Inspection overhead is the extra time, labor, and computing work spent checking something more carefully when confidence in it drops. In cybersecurity, that can mean deeper packet inspection, additional log review, repeated file scans, manual approval steps, or re-running validation on systems that no longer look fully trustworthy. The cost is not the inspection itself, but the slowdown and resource drain it creates.
This matters because attackers often try to trigger uncertainty. Suspicious behavior, failed checks, or inconsistent data can force defenders to inspect more aggressively, which consumes analyst time and system capacity. At the same time, strong defenses also create inspection overhead by design: multifactor authentication, content filtering, code review, and integrity checks all add friction to reduce risk. Good security programs try to balance that overhead against the value of the trust gained.