How to improve reindexing magento 2.3.3 [EE]?

1. Change all indexer mode to 'Update by Schedule'

2. Changing the batch size can help you optimize indexer running time. https://devdocs.magento.com/guides/v2.4/extension-dev-guide/indexer-batch.html

3. If customer indexer is there, make sure the logic is optimized.

Thanks!

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