uschindler commented on PR #13351:
URL: https://github.com/apache/lucene/pull/13351#issuecomment-2102223583

   > > Actually that's wanted: Because we want tests by default run fast. For 
that the CI env var sets empty jvmargs. With your latest change we randomly 
slowdown the tests.
   > 
   > It's not clear whether tests will run faster when Panama Vector is enabled 
without C2 or not. I'll check this.
   > 
   > > So please revert your commit.
   > 
   > Happy to revert, if it turns out to be faster without it.
   
   The reason for the jvmargs is to not enable C2 for our short running tests 
with lots of randomization. This causes dramatic overhead (Robert tested this) 
on total test runtime. So we use the default C2 JVM settings only on CI, where 
50% longer total runtime does not matter.
   
   Without that hack we could revert a lot of code.


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