This guide outlines best practices for improving Microsoft Dynamics 365 Business Central performance. It covers key bottlenecks such as inefficient AL code, SQL performance, and integration issues. Recommendations include using telemetry tools like Application Insights, optimizing AL code with better keys and temp tables, tuning SQL indexes and execution plans, and scheduling job queues appropriately. It also emphasizes optimizing reports, API usage, and configuring the environment for production loads. These strategies collectively help in maintaining a responsive, scalable, and efficient Business Central environment.