running 4.x

MySQL is very slow to return a large result set of about 45,000 records.
The query seems to execute in a few seconds, but then it takes another 90
seconds to return all the data.

The same query only takes 6 seconds to execute and return on MSSQL server,
so I must have something setup wrong ( <- MySQL newbie )

I am using MyCC to issue the query.

I already tried increasing the key_buffer_size and some other varaibles.

here is the create:

CREATE TABLE `tbl_PO_MainDetail` (
  `nItemID` int(11) NOT NULL default '0',
  `sPOID` varchar(50) NOT NULL default '',
  `nNum` smallint(6) NOT NULL default '0',
  `sJobID` varchar(50) NOT NULL default '',
  `sItemID` varchar(30) NOT NULL default '',
  `nMatlID` int(11) NOT NULL default '0',
  `sDescription` varchar(250) NOT NULL default '',
  `sUnits` char(3) NOT NULL default '',
  `sMatlSize` varchar(10) NOT NULL default '',
  `nMatlTypeID` int(11) NOT NULL default '0',
  `sMatlShape` varchar(10) NOT NULL default '',
  `sMatlAlloy` varchar(15) NOT NULL default '',
  `dMatlQtyBars` double NOT NULL default '0',
  `dMatlQtyBarsRec` double default NULL,
  `dMatlQtyBarsDue` double default NULL,
  `dMatlLength` double default NULL,
  `sOperation` varchar(50) NOT NULL default '',
  `sRev` varchar(9) NOT NULL default '',
  `dQty` double NOT NULL default '0',
  `dQtyRec` double NOT NULL default '0',
  `dQtySent` double NOT NULL default '0',
  `dQtyDue` double default NULL,
  `dQtyToRec` double NOT NULL default '0',
  `dQtyToRecEA` double NOT NULL default '0',
  `dQtyToRecUnit` double NOT NULL default '0',
  `dQtyToRecBars` double NOT NULL default '0',
  `dPrice` double NOT NULL default '0',
  `yTaxable` tinyint(1) NOT NULL default '0',
  `dExt` double NOT NULL default '0',
  `dExtTax` double NOT NULL default '0',
  `nGLAccountID_Expense` int(11) NOT NULL default '0',
  `sGLExpenseIDX` varchar(50) NOT NULL default '',
  `dOpNum` double NOT NULL default '0',
  `dFPP` double NOT NULL default '0',
  `nEmpID_For` int(11) NOT NULL default '0',
  `bBarNoBreak` tinyint(3) unsigned default NULL,
  `upsize_ts` varchar(16) NOT NULL default '',
  PRIMARY KEY  (`nItemID`),
  KEY `FK_tbl_PO_Main` (`sPOID`),
  KEY `_WA_Sys_dPrice_398D8EEE` (`dPrice`)
) TYPE=MyISAM;



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