Slow DBlink Update query

Hi ,

Oracle Version : 11.2.0.4.0

I have an Update query which accesses remote DB for a select query.It is running forever and have to kill every time.Below is the query and plan.This query is waiting for 'SQL*Net message from dblink'.I have tried creating a view in remote DB based on select query and fetched from view@dblink.Still performance is slow.Kindly assist.

UPDATE DTL_INVOICE_LINES set

viol_prev_invoiced =

CASE

  WHEN viol_sr_unmatched = 1 -- need data from enrichment or this rule will always fail

  THEN null

  WHEN id in

  (select id from dtl_invoice_lines curr_inv