robertwb commented on a change in pull request #12352:
URL: https://github.com/apache/beam/pull/12352#discussion_r466727740
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File path: website/www/site/content/en/documentation/sdks/python-type-safety.md
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@@ -210,7 +210,21 @@ However, if you enable runtime type checking, the code is
guaranteed to fail at
{{< code_sample "sdks/python/apache_beam/examples/snippets/snippets_test.py"
type_hints_runtime_on >}}
{{< /highlight >}}
-Note that because runtime type checks are done for each `PCollection` element,
enabling this feature may incur a significant performance penalty. It is
therefore recommended that runtime type checks are disabled for production
pipelines.
+Note that because runtime type checks are done for each `PCollection` element,
enabling this feature may incur a significant performance penalty. It is
therefore recommended that runtime type checks are disabled for production
pipelines. See the following section for a quicker, production-friendly
alternative.
+
+### Faster Runtime Type Checking
+You can enable faster, sampling-based runtime type checking by setting the
pipeline option `performance_runtime_type_check` to `True`.
+
+The is a Python 3 only feature that works by runtime type checking a small
subset of values, called a sample, using optimized Cython code.
Review comment:
Ack. Sounds good to keep it as Python 3 only.
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