webmethods API Gateway: AGW 10.15 Analytics UI Freeze on Large Payload

PROBLEM DESCRIPTION
When opening a transaction in the API Gateway Analytics UI that has a large response payload, the browser tab becomes completely unresponsive and displays
the "Page is not responding" (German: "Seite reagiert nicht") dialog. The user must either wait (potentially minutes) or close the tab.

The root cause appears to be that the API Gateway Analytics frontend (Angular-based) renders the full content of the reqPayload and resPayload
fields from Elasticsearch directly into the DOM without any length restriction, truncation, or lazy loading. For large payloads this causes the browser's
JavaScript engine and DOM renderer to freeze.

EXPECTED BEHAVIOR
The UI renders the transaction detail with truncated payload fields (e.g. first 1,000-5,000 characters) and offers an option to expand or download the full
payload separately.

ACTUAL BEHAVIOR
The UI attempts to insert the full 5.3 MB payload string into the DOM at once, blocking the browser's main thread. The tab becomes unresponsive.

CONCRETE EVIDENCE — AFFECTED TRANSACTION
API Name:          <customer internal>
API Version:       2026_05
API ID:            f7256960-674c-4fa1-8362-c3052544c6c4
Transaction Date:  2026-09-29 05:14:54 UTC
Application:       EFS (IP: 185.197.164.18)
Status:            SUCCESS
Total Time:        18,103 ms
reqPayload size:   6,281 characters (~6 KB)
resPayload size:   5,575,516 characters (~5.3 MB)  <-- ROOT CAUSE

Data retrieved via REST API:
 POST /rest/apigateway/search

REQUESTED FIX
Customer requests a fix in the API Gateway Analytics UI (Angular frontend) to implement one or more of the following:

1. Truncate payload fields in the Transaction Detail view to a configurable
  maximum length (e.g. 5,000 characters by default), with a "Show full
  payload" / "Download" button for the remainder.

2. Lazy rendering / virtual scrolling for large string fields in the JSON view.