What are some common causes of slow response times on the server-side that could lead to a DCC error 10057 on the client's 'send' function?

Common server-side causes include: high CPU usage, insufficient memory, database query bottlenecks, excessive I/O operations, blocking operations within the server's request handling logic, and a large number of concurrent connections exceeding the server's capacity. Profiling the server application can help identify these bottlenecks.