Calculating impact of indexes for DML

Hi all,
Is it possible to gauge/capture impact of having (a bit too many) indexes on
tables for DML operations? I know one can always drop and measure, but
outside of that are there any other methods? This relates to DW and staging
environment so multi-million row inserts do happen, db is 10203. I am trying
to set-up a test env but it is going to take time.

Many thanks in advance
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Best regards
Raj

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