I used VThreads recently with good results I should say. In my case I limited concurrency by a blocking queue of concurrent tasks. So number of virtual threads

I used VThreads recently with good results I should say. In my case I limited concurrency by a blocking queue of concurrent tasks. So number of virtual threads does not keep rising based of millions of input records I was processing. I found for me keeping VThreads about ~100X of concurrent call to external resources was kind of sweet spot for overall throughput.