Why reports are fast when tables are available in local user

Dear All,
I have one report refering ws1,ws2,t1,t2 which are in user "test".
so in my qery of report i will write the query as
select a.code,b.edu,c.dept_name,d.desg_desc
from test.ws1 a,test.ws2 b,test.t1 c,test.t2 d
where a.code = b.code
and a.dept = c.dept
and a.desg = d.desg
The report is logged in by "user123" who is having select grant on all the above 4 tables.
Report runs but takes time.
But if i make the above 4 tables available in "user123" and write the query(removed user name in from clause) as
select a.code,b.edu,c.dept_name,d.desg_desc
from .ws1 a,ws2 b,.t1 c,t2 d
where a.code = b.code
and a.dept = c.dept
and a.desg = d.desg
and then report is logged in by "user123"
Report runs and takes considerably less time.
My understanding is when tables are available in current user it takes less time because it does'nt have to go to other user and search for the tables.
Is it correct or there are some other reasons for it.
Kindly advice
Best Regards,
Devendra

If the tables are owned by a user in the same database then there should be no difference in performance.

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