Performance measures how fast a system responds to requests under current load:
Response time for individual requests
Throughput (requests per second)
Resource utilization (CPU, memory) Scalability measures how well performance is maintained as load increases:
Vertical scaling: Adding more power to existing machines
Horizontal scaling: Adding more machines to handle load Example: A system might have good performance (responds in 100ms) but poor scalability (response time increases to 5 seconds when user load doubles).
Rewriting in plainer words…
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