Can you check if your catalog item triggers flows or workflows that run synchronously or have approval sub-flows. If the service catalog request kicks off a Flow Designer flow that creates child tasks, generates approvals, or calls integrations, that processing time adds up. Consider whether any of those flows can be made asynchronous or simplified in your test data setup.
Also review your test design. Instead of having the ATF test submit the catalog item and then immediately verify fields on the resulting RITM/SCTASK in the same browser session, consider using Server-side test steps (like "Record Validation" or "Run Server-Side Script") to verify the records were created correctly. These don't rely on the browser UI and won't trigger the unresponsive warning.
