How to reduce time when updating table with join of anther table

Hi all,
I am update table Policy1 using another table from other scheme
Policy1 is in schema "TEST".
TRN_POLICY_RISK_GIS is in Schema "TEST2".
Now i am executing my query which is taking lot of time to update and make cpu utilization upto 45%.
update policy1 set total_si = (select total_is from (select pol_sys_id,
avg(nvl(pol_cvr_si,0)) total_si from TEST2.TRN_POLICY_COVER_GIS tpcg
group by pol_sys_id ) b where p.pol_sys_id = b.pol_sys_id)
Help to optimize to given query.

update policy1    A
    set total_si =
       (select avg(nvl(pol_cvr_si,0))
           from TEST2.TRN_POLICY_COVER_GIS    B
          where B.pol_sys_id = A.pol_sys_id
;hopefully there is an index on TEST2.TRN_POLICY_COVER_GIS (POL_SYS_ID)

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