Have you had the same problem with DuplicateFilter on FME 2018 I have 209/35k but on FME 2019.1 I have 12k/35k. I don't know how but it works not ok in 2019?
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I would recommend you to contact Safe support, with sending sample dataset and workspaces (2018 and 2019) which reproduce the issue.
https://www.safe.com/support/report-a-problem/