GPU makes LR CC slow

Hi
I have a desktop with a ATI R7 240 Graphic Card. I can activate the gpu usage in LR without any error message.
But LR CC is horribly slow then. As soon as I deactivate the gpu in LR Settings it works normally. I installed the newest ATI driver but without luck.
Any ideas?

Joshua Cohen schrieb:
Leave it turned off.
Yeah. Right. How could I not think about that. I mean Adobe advertises the GPU thing as an great feature that speeds everything up. But on some gpu it does just the opposite!

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apex_item.text (28, R.fcg, 80, 100,
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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,
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apex_item.text (36, R.EFR, 80, 100,
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|| 'color:solid darkgreen;background-color:#FFF4BF;font-weight:bold" readonly="readonly"title="Efr"', 'f36_' || LPAD (ROWNUM, 4, '0')) EFR,
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get_PK_status(R.PK) IN ('Edited','Reviewed','Approved') and
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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'))
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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,
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'f38_' || LPAD (ROWNUM, 4,'0'))
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get_PK_status(R.PK) IN ('Edited','Reviewed','Approved','Disapproved') and
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apex_item.text (38,R.rqmt,80,100,
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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
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apex_item.text (38, R.RQMT,80,100,
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'style="width:75px;text-align:right;'
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'style="width:75px;text-align:right;'
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|| '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
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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
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apex_item.text (39, RU.RQMT, 80, 100,
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Does OS X Lion make start up slower if you install it?

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