When troubleshooting client performance issues within NetSuite or any other web-based application, the recommended action is to "Close all applications you are not using." This approach helps to free up system resources such as memory and CPU usage that might be consumed by other applications running on the user's computer. Excessive resource consumption by multiple applications can lead to decreased performance, including slower response times and lag when interacting with web applications. By closing unnecessary applications, users can ensure that their system is optimized for the best possible performance when using NetSuite, thereby reducing the likelihood of performance-related issues.References: NetSuite Help Center, Performance Troubleshooting documentation.