Sorting makes the report slow

Hi,
I need to sort the SQL (APEX_ITEM) report. I created a hidden item and used the hidden item to sort the report. Its working fine but making the report very slow.
If I remove the sorting, then the report runs fast.
Please let me know what should do to make it faster.
Thanks.

Hi Denes,
Here is my query:
SELECT apex_item.hidden (21, R.pk) || apex_item.hidden (22, R.imo) || apex_item.hidden (23, wwv_flow_item.md5 ( R.PK ,R.RQMT )) ||
apex_item.hidden (24,R.imso)|| apex_item.hidden (25, R.installation_number )|| apex_item.hidden (26, R.base_code) ||
apex_item.text (27, R.year, 80,100,
'style="width:40px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly" title="Year"', 'f27_' || LPAD (ROWNUM, 4, '0')) year ,
apex_item.text (28, R.fcg, 80, 100,
'style="width:64px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly" title="Fcg"', 'f28_' || LPAD (ROWNUM, 4, '0')) fcg,
apex_item.text (29, R.IMO_NAME, 80, 100,
'style="width:90px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly"title="Imo"', 'f29_' || LPAD (ROWNUM, 4, '0')) IMO_NAME,
apex_item.text (30, R.IMSO_NAME, 80, 100,
'style="width:96px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly" title="Imso"', 'f30_' || LPAD (ROWNUM, 4, '0')) IMSO_NAME,
apex_item.text (31, R.installation_NAME, 80, 100,
'style="width:140px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly" title="Installation"', 'f31_' || LPAD (ROWNUM, 4, '0')) INSTALLATION_NAME,
apex_item.text (32, R.BASE_NAME, 80, 100,
'style="width:160px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly"title="Base"','f32_' || LPAD (ROWNUM, 4, '0'))BASE_NAME,
apex_item.hidden (33, R.FCG_DESC) ||
apex_item.text (34,R.FAC, 80, 100,
'style="width:75px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly"title="Fac"','f34_' || LPAD (ROWNUM, 4, '0')) FAC,
apex_item.hidden (35, R.FAC_DESC)||
apex_item.text (36, R.EFR, 80, 100,
'style="width:75px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly"title="Efr"', 'f36_' || LPAD (ROWNUM, 4, '0')) EFR,
apex_item.hidden (37,R.EFR_DESC) ||
case when
get_PK_status(R.PK) IN ('Edited','Reviewed','Approved') and
:P2_Role = 'EDITOR' then
apex_item.text (38, R.rqmt,80,100,
'style="width:75px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly"title="Requirement"', 'f38_' || LPAD (ROWNUM, 4, '0'))
when
nvl(get_PK_status(R.PK),'X') not in ('Edited','Reviewed','Approved') and
:P2_Role = 'EDITOR' then
apex_item.text (38,R.RQMT,
80, 100,
'style="border:1.3px solid black;width:75px;text-align:right;'
|| 'color:darkblue;font-weight:bold title="Requirement"',
'f38_' || LPAD (ROWNUM, 4,'0'))
when
get_PK_status(R.PK) IN ('Edited','Reviewed','Approved','Disapproved') and
:P2_Role = 'REVIEWER' then
apex_item.text (38,R.rqmt,80,100,
'style="width:75px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly"title="Requirement"', 'f38_' || LPAD (ROWNUM, 4, '0'))
when
nvl(get_PK_status(R.PK),'X') NOT IN ('Edited') and
:P2_Role = 'REVIEWER' then
apex_item.text (38, R.rqmt,80,100,
'style="width:75px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly"title="Requirement"', 'f38_' || LPAD (ROWNUM, 4, '0'))
when get_PK_status(R.PK) = 'Edited' and
:P2_Role = 'REVIEWER' then
apex_item.text (38, R.RQMT,80,100,
'style="width:75px;text-align:right;'
|| 'color:darkblue;font-weight:bold title="Requirement"',
'f38_' || LPAD (ROWNUM, 4, '0'))
when get_PK_status(R.PK) IN ('Edited','Reviewed','Approved','Disapproved') and
:P2_Role = 'APPROVER' then
apex_item.text (38, R.rqmt,80,100,
'style="width:75px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly"title="Requirement"', 'f38_' || LPAD (ROWNUM, 4, '0'))
when nvl(get_PK_status(R.PK),'X') NOT IN ('Reviewed') and
:P2_Role = 'APPROVER' then
apex_item.text (38, R.rqmt,80,100,
'style="width:75px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly"title="Requirement"', 'f38_' || LPAD (ROWNUM, 4, '0'))
when get_PK_status(R.PK) = 'Reviewed' and
:P2_Role = 'APPROVER' then
apex_item.text (38,R.RQMT,80, 100,
'style="width:75px;text-align:right;'
|| 'color:darkblue;font-weight:bold title="Requirement"',
'f38_' || LPAD (ROWNUM, 4, '0'))
end RQMT,
case when get_PK_status(R.PK) = 'Edited' and
:P2_Role in('EDITOR','REVIEWER','APPROVER') then
apex_item.text (39, RU.RQMT, 80, 100,
'style="width:75px;text-align:right;'
|| 'color:solid darkred;background-color:yellow;font-weight:bold " readonly="readonly"title="Edited"' , 'f39_' || LPAD (ROWNUM, 4, '0'))
when nvl(get_PK_status(R.PK),'X') NOT IN ('Edited','Reviewed','Approved','NotReviewed','Disapproved') and
:P2_Role in('EDITOR','REVIEWER','APPROVER') then
apex_item.text (39, RU.RQMT, 80, 100,
'style="width:75px;text-align:right;'
|| 'color:solid darkred;background-color:#FFF4BF;font-weight:bold " readonly="readonly"title="New Requirement"' , 'f39_' || LPAD (ROWNUM, 4, '0'))
when get_PK_status(R.PK) IN ('Reviewed') and
:P2_Role in('EDITOR','REVIEWER','APPROVER') then
apex_item.text (39, RU.RQMT, 80, 100,
'style="width:75px;text-align:right;'
|| 'color:solid darkred;background-color:lime;font-weight:bold " readonly="readonly"title="Reviewed"' , 'f39_' || LPAD (ROWNUM, 4, '0'))
when get_PK_status(R.PK) IN ('Approved') and
:P2_Role in('EDITOR','REVIEWER','APPROVER') then
apex_item.text (39, RU.RQMT, 80, 100,
'style="width:75px;text-align:right;'
|| 'color:solid black;background-color:#DAFFBF;font-weight:bold " readonly="readonly"title="Approved"' , 'f39_' || LPAD (ROWNUM, 4, '0'))
when get_PK_status(R.PK) IN ('Disapproved') and
:P2_Role in('EDITOR','REVIEWER','APPROVER') then
apex_item.text (39, RU.RQMT, 80, 100,
'style="width:75px;text-align:right;'
|| 'color:SOLID black;background-color:RED;font-weight:bold " readonly="readonly"title="Not Approved"' , 'f39_' || LPAD (ROWNUM, 4, '0'))
when get_PK_status(R.PK) IN ('NotReviewed') and
:P2_Role in('EDITOR','REVIEWER','APPROVER') then
apex_item.text (39, RU.RQMT, 80, 100,
'style="width:75px;text-align:right;'
|| 'color:SOLID black;background-color:orange;font-weight:bold " readonly="readonly"title="Not Reviewed"' , 'f39_' || LPAD (ROWNUM, 4, '0'))
end NEW_RQMT,
apex_item.text (40, RU.Status, 80,100,
'style="width:75px;text-align:right;'
|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold " readonly="readonly"title="Status"', 'f40_' || LPAD (ROWNUM, 4, '0')) STATUS ,
CASE WHEN (get_PK_status(R.PK) IN('Edited','Reviewed','NotReviewed') and :P2_Role = 'APPROVER') THEN APEX_ITEM.SELECT_LIST(41,'Approved','Approved;Approved,Disapproved;Disapproved','','title="This field is only for Reviewers and Approvers"')
WHEN (get_PK_status(R.PK) = 'Edited' and :P2_Role = 'REVIEWER') THEN
APEX_ITEM.SELECT_LIST(41,'Reviewed','Reviewed;Reviewed,NotReviewed;NotReviewed','','title="This field is only for Reviewers and Approvers"')
ELSE
APEX_ITEM.SELECT_LIST(41,'','','title="This field is only for Reviewers and Approvers"')
END ACTION ,
'<a href="javascript:popUp2('''
|| 'f?p=&APP_ID.:3:&SESSION.::NO::P2_PK:'
|| R.PK
|| ''', 1200, 500);">'
|| '<img src="#APP_IMAGES#blue_book_open.gif" title="View Row History" >'
|| '</a>' History
from rplans_sumtab R,
(SELECT PK, RQMT, STATUS, DATE_CREATED FROM RPLANS_USER_SUMTAB R1
WHERE DATE_CREATED = (SELECT MAX(DATE_CREATED) FROM RPLANS_USER_SUMTAB R2
WHERE R2.PK = R1.PK)) RU
WHERE R.PK = RU.PK(+)
2.) The pagination I am using is:
Row Ranges 1-15 16-30 (with set pagination)
3)The table has only 1000 records.
The report runs very fast when I don't use sorting, but when I use sorting, it becomes very slow.
Thanks.

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