When a traffic spike occurs on a production JSS site, Sitecore XP performance might get worse, and the response time per request might increase significantly. When the Web database usage increases to 100%, the site might become unresponsive. The issue is caused by inefficient dictionary translation in JSS 11.0–13.0.
To resolve the issue, download and install the hotfix compatible with the affected product version:
Be aware that the hotfixes were built for the specific Sitecore XP and JSS versions and must not be installed on other Sitecore XP and JSS versions or in combination with other hotfixes. In case any other hotfixes have already been installed on a certain Sitecore XP instance, send a request for a compatibility check to Sitecore Support.
Note that the ZIP file contents must be extracted to locate installation instructions and related files inside. The hotfix must be installed on a CM instance and then synced with other instances using standard development practices.