This study examines web application performance testing by focusing on responsiveness, throughput, and scalability to evaluate the effectiveness of computer systems, networks, and software applications. It assesses a specific protocol's performance through four tests: performance load, process start-up time, web application infrastructure, and resource allocation. Using Apache JMeter, tests were conducted on the RSMD and E-government websites. The results revealed instability and performance degradation in the RSMD website over time, with server-to-client response time increasing as the test duration and load increased. The E-GOV website's performance initially appeared stable but also degraded over time. A test ramp time of 10 seconds and five looping iterations showed significant performance degradation. Future research should address these issues to improve web application performance under load conditions. The study also discusses testing tools, including JMeter, for evaluating website performance under various load conditions. Key findings include the instability of the RSMD website and the performance deterioration of the E-GOV website, especially in scenarios with a 10-second ramp time and five loop iterations. These insights provide valuable guidance for developing strategies to optimize website performance under high-traffic conditions.