Java 7 WatchService 对其他人来说是否很慢

Java 7的WatchService对于其他人来说是否很慢？

java
import java.nio.file.*;
public class WatchServiceExample {
    public static void main(String[] args) throws Exception {
        // 创建WatchService对象
        WatchService watchService = FileSystems.getDefault().newWatchService();
        // 监视指定目录的变化
        Path directory = Paths.get("path/to/directory");
        directory.register(watchService, StandardWatchEventKinds.ENTRY_CREATE,
                StandardWatchEventKinds.ENTRY_MODIFY, StandardWatchEventKinds.ENTRY_DELETE);
        // 启动监视线程
        Thread watchThread = new Thread(() -> {
            while (true) {
                try {
                    WatchKey key = watchService.take();
                    for (WatchEvent event : key.pollEvents()) {
                        System.out.println("Event kind: " + event.kind() + ", File affected: " + event.context());
                    }
                    key.reset();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
        watchThread.start();
        // 模拟文件变动
        Path file = Files.createTempFile(directory, "test", ".txt");
        Files.write(file, "Hello, World!".getBytes());
        Files.delete(file);
        // 等待监视线程处理事件
        Thread.sleep(2000);
        // 停止监视线程
        watchThread.interrupt();
    }
}