logstash Input painfully slow while fetching messa

Question

I have configured JMS input in logstash to subscribe to JMS topic messages and push messages to elastic search.

input {

  jms {
      id => "my_first_jms"
      yaml_file => "D:\softwares\logstash-6.4.0\config\jms-amq.yml"
      yaml_section => "dev"
      use_jms_timestamp => true
      pub_sub => true
      destination => "mytopic"
#     threads => 50
    }
}

filter {
    json{
      source => "message"
    }

}

output {
    stdout { codec => json }

    elasticsearch {
      hosts => ['http://localhost:9401']
      index => "jmsindex"
  }
}

System specs:

RAM: 16 GB
Type: 64 bit
Processor: Intel i5-4570T CPU @ 2.9 GHz

This is extremely slow. Like 1 message every 3-4 minutes. How should I debug to figure out what is missing?

Note: Before this, I was doing this with @JMSListener in java and that could process 200-300 records per sec easily.