Poor performance of CONNECT BY PRIOR

Hi All

I am facing performance issue of one view which is using CONNECT BY PRIOR.

The View is as below:

CREATE OR REPLACE VIEW  P_VIEW_NAME AS

SELECT xpn.quote_id,

  version_no

  /*, ROW_NUMBER() OVER(ORDER BY quote_id, version_no asc)*/

  ,

  discount

FROM TABLE_A xpn

UNION

SELECT DISTINCT connect_by_root (xpm.new_quote_id) AS quote_id,

  version_no

  /*, ROW_NUMBER() OVER(ORDER BY quote_id, version_no asc)*/

  ,

  discount

FROM TABLE_B xpm,

  TABLE_A xpn

WHERE xpn.quote_id                       = xpm.original_quote_id

AND xpm.status                           = 'C'

AND xpm.new_quote_id                    IS NOT NULL