Performance is the ability of a business process or system to keep delivering its expected results over time. In cybersecurity, this can mean maintaining service availability, processing transactions reliably, and enforcing security controls without making operations unusably slow.
Attacks, system failures, and poorly managed changes can degrade performance, causing delays, outages, or missed security alerts. Defenders monitor measures such as availability, response time, error rates, and control effectiveness to spot problems and verify that systems remain dependable. During upgrades or security changes, testing and gradual rollout help preserve performance while reducing operational risk.