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Support Article

Pega Marketing application performance issue



User is experiencing poor performance when executing outbound email campaigns and time-outs when accessing the portal.
Also experiencing time-outs while trying to access links in emails (that redirect via HTTP Response Service).

Error Messages

“server reached MaxRequestWorkers

Steps to Reproduce

Run an Outbound email Campaign with 400,000 cases, sending HTML formatted email via SMTP relay.

Root Cause

The cause of the initial problem was Requestor Pool exhaustion.

​It was not because the pools were incorrectly sized, but more because the incoming traffic was not being serviced quickly enough, and the requests were backlogged.


Perform necessary load tests to correctly size the application server nodes.

Published August 23, 2017 - Updated December 2, 2021

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