check bucket index on large bucket leads to laggy index PGs

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Hi,

I have a bucket that got >20m index entries but only got 11 shards. 

When I try to run a radosgw-admin bucket check the PGs that hold the index start to become laggy after a couple of seconds. I need to stop it because it kills the whole object storage. 

This is a latest reef cluster and the master of a multisite which only replicates the metadata (1 realm, multiple zonegroups, one zone per zonegroup). 

Any ideas what I can do?
I fear to reshard the bucket, because I am not sure if I can stop the resharding if the PGs become laggy.

Cheers
 Boris 
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