我需要在Java上运行多个cURL命令。我一直在寻找各种方法来实现这一点。其中一种方法是使用ProcessBuilder。我编写的代码如下所示：

private void performCurl() {
   ProcessBuilder processBuilder = new ProcessBuilder();
        List<String> curlArgs = getMyCurlArgs(); // curl -k -v https://www.amazon.com -H <and so on>
        String listString = String.join(" ", curlArgs);
        processBuilder.command(curlArgs);
        processBuilder.redirectErrorStream(true);
        Process proc = processBuilder.start();
       
        ExecutorService fixedThreadPool = Executors.newFixedThreadPool(poolSize);
        Future<String> futureOpt;
        try {
            futureOpt = fixedThreadPool.submit(() -> {
                StringBuilder sb = new StringBuilder();
                InputStream ins = proc.getInputStream();
                BufferedReader br = new BufferedReader(new InputStreamReader(ins));
                br.lines().forEach(sb::append);
                try {
                    ins.close();
                    br.close();
                } catch (IOException e) {
                    // my exception
                }
                return sb.toString();
            });
            boolean terminatedNormally = proc.waitFor(15, TimeUnit.SECONDS);
            if (!terminatedNormally)
                throw new SocketTimeoutException("Timed Out");
        } finally {
            fixedThreadPool.shutdown();
            proc.destroy();
        }
        String content = futureOpt.get(); // This content is what I use.
}

现在上面的代码可以正常工作了。cURL抓取网站并提供HTML内容。The problem is that ProcessBuilder with cURL is extremely CPU intensive. Especially given the fact that ProcessBuilder makes use of Operating System resources.
我现在的问题是：
a）我可以更有效地使用ProcessBuilder吗？
B）或者，是否有其他机制可以触发Java上的并行cURL请求？
是否有其他方法可以并行运行cURL请求？