GWphua commented on PR #18457:
URL: https://github.com/apache/druid/pull/18457#issuecomment-3252894496

   Yea, you are right about the lack of performance improvement @kfaraz 
   
   From my flame graph below, I thought the performance to be because of the 
JsonMapper spending a lot of time to break down the type. Though, i found the 
bulk of the bottleneck is caused by Interval deserialization, which is 
addressed in #18477
   
   <img width="1920" height="958" alt="image" 
src="https://github.com/user-attachments/assets/159ca5d5-6537-44b1-863f-6c680ff38198";
 />
   
   Still, its nice to see that we can get a performance enhancement via using 
JavaType / ObjectReader. We can merge this PR, especially since this path is 
called a lot especially for larger clusters.


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