A servlet can process AJAX requests using both the doGet and doPost methods. The choice depends on the nature of the AJAX request and the type of data being sent. Using both methods allows flexibility in handling various types of AJAX requests within the same servlet.

Implementing gzip compression for responses in servlets optimizes performance by reducing response size, minimizing network latency, and improving overall user experience during data transfer.

To optimize performance, a servlet should cache frequently used data in the ServletContext to make it available to all components of the web application.

The doPost() method in HTTP servlets is commonly used for handling form submissions as it is designed for processing data sent in the body of an HTTP POST request.

To minimize server load, servlets can implement Asynchronous Servlets to handle asynchronous processing and improve the overall scalability of the application.

The GET method is idempotent and is used primarily for retrieving data from the server.

Using asynchronous processing in servlets is effective for reducing response time by allowing the server to handle other tasks while waiting for I/O operations, leading to improved overall system responsiveness.

Connection pooling optimizes database interactions by reusing existing database connections, reducing the overhead of establishing a new connection for each request.

Using StringBuilder instead of concatenation in loops for string manipulation enhances performance in servlets because StringBuilder is more efficient in handling string concatenation operations.

In high-performance servlets, the Flyweight pattern can be used to manage resource-intensive objects efficiently by sharing common parts of state among multiple objects.