add some clarification around usage

docs/source/api/apollo-server.mdx

@@ -500,10 +500,15 @@ Apollo Server v5 will _always_ behave as if this option is `true` (and will igno
 `Boolean`
 </td>
 <td>
-
-⚠️ Caution: this option can lead to security vulnerabilities and unexpected behavior. Use of this option in production is not supported by Apollo.
+⚠️ Caution: this option can lead to security vulnerabilities and unexpected
+behavior. Use of this option in production is not supported by Apollo.
 
 When set to `true`, disable validation of graphql operations entirely.
+
+You might find this option interesting for performance reasons if you handle
+operation validation at build time and enforce that only known, validated
+operations are allowed to be executed at runtime. Note that validation of
+operations is cached in Apollo Server's document store.
 </td>
 </tr>