What are the best practices in web application testing to ensure performance, security, and usability?

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To ensure web applications perform optimally, follow a combination of best practices: regularly conduct load and stress testing to gauge performance under heavy traffic; implement security testing like penetration tests and vulnerability scans to safeguard data; and perform usability testing with real users to identify navigation issues. Automate where possible, monitor continuously, and update based on feedback for reliability and a smooth experience.