Udi Meiri created BEAM-9489:
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             Summary: python typehints: reduce the number of runtime-type-check 
wrappers
                 Key: BEAM-9489
                 URL: https://issues.apache.org/jira/browse/BEAM-9489
             Project: Beam
          Issue Type: Bug
          Components: sdk-py-core
            Reporter: Udi Meiri


The --runtime_type_check flag is considered to be a performance penalty.
One of the possible slowdowns is the wrapper around DoFn.process(), which adds 
an extra call to the wrapped process() method.
Currently, there are 2 wrappers applied: OutputCheckWrapperDoFn and 
TypeCheckWrapperDoFn. These could be merged into one to possibly save on 
overhead. 



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