Is it possible to improve performance when processing large-scale queries?

Yes, performance when processing large-scale requests in Java can be improved in several ways:

• Parallelism and multithreading: Using threads, thread pools, or frameworks like Fork/Join to parallelize processing.
• Query and algorithm optimization: Refactoring bottlenecks, using more efficient data structures.
• Caching: Storing results of expensive operations to avoid re-execution.
• Using asynchronous I/O (NIO): For network operations and file handling.
• Profiling and monitoring: Identifying and fixing bottlenecks.

For example, for parallel processing of a list of requests, you can use parallelStream():

List<Request> requests = ...;
requests.parallelStream().forEach(request -> process(request));

This allows utilizing multiple CPU cores to speed up processing.