Make the default for epoll_instances io_threads/2

test_config.toml

@@ -7,10 +7,9 @@ port = 8080
 # Maximum request size in bytes (for 413 Content Too Large responses)
 max_request_size_bytes = 1048576  # 1MB
 # Number of I/O threads for handling connections and network events
-io_threads = 6
+io_threads = 12
 # Event batch size for epoll processing
 event_batch_size = 32
-epoll_instances = 2
 
 [commit]
 # Minimum length for request_id to ensure sufficient entropy