Performance Evaluation of Cloud Service Models (IaaS, PaaS, SaaS)

Abstract

Cloud computing provides on-demand access to configurable computing resources and services over the Internet. The primary service models Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS) offer different levels of control, abstraction, and performance trade-offs. This paper presents a comprehensive performance evaluation of these models using metrics such as response time, throughput, scalability, resource utilization, availability, and cost efficiency. Analytical formulas are introduced to quantify performance, and a synthetic benchmarking study is used to illustrate relative behaviour under varying concurrent user loads. Results suggest that SaaS is the most cost-efficient and easiest to adopt for routine academic functions, PaaS provides a balance for development and teaching labs, and IaaS is suitable for research workloads requiring fine-grained control. Recommendations for higher-education adoption strategies are provided.