Use the below control parameters to decide your webMethods performance fine tuning

watt.server.broker.producer.multiclient

Specifies the number of sessions for the default client. The default client is the Broker

client that the Integration Server uses to publish documents to the Broker and to retrieve

documents delivered to the default client. When you set this parameter to a value greater

than 1, the Integration Server creates a new multi–session, shared state Broker client

named clientPrefix_DefaultClient_MultiPub, to use for publishing documents to the

Broker. Using a publishing client with multiple sessions can lead to increased

performance because it allows multiple threads to publish documents concurrently. The

default is 1 session.

watt.server.broker.replyConsumer.multiclient

Specifies the number of sessions for the request/reply client. The request/reply client is

the Broker client that the Integration Server uses to send request documents to the Broker

and to retrieve reply documents from the Broker. Increasing the number of sessions for

the request/reply client can lead to improved performance because it allows multiple

requests and replies to be sent and retrieved concurrently. The default is 1 session.

watt.server.control.triggerInputControl.delays

which corresponds to Poll delay Interval). By setting this to a specific value say X ms, you can force the trigger to keep polling the Broker after every X ms indefinitely until a document is available. 

watt.server.control.triggerInputControl.delayIncrementInterval

which corresponds to poll delay Interval Increment.