yuzawa-san opened a new pull request, #21281:
URL: https://github.com/apache/kafka/pull/21281

   i was profiling kafka-connect when i found a small hotspot related to 
iterating over the fields. i believe the solution was to not use the iterator.
   
   here is the flamechart for cpu where i found this (the blue specifically):
   
   <img width="1620" height="449" alt="image" 
src="https://github.com/user-attachments/assets/e7a7121e-ca38-43ea-9e64-58890e57b826";
 />
   
   
   inset:
   
   <img width="1628" height="555" alt="image" 
src="https://github.com/user-attachments/assets/54081aab-7505-4433-a31b-d81f8f3d7d13";
 />
   
   
   i am independently trying to optimize the schema-registry library as well.


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