Description:
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When attempting to use ADODB.RecordSet COM object to query an MS Access database via a DSNless connection, setting the CursorLocation to adUseClient causes a significant delay on the processing of a query execution. 

ASP has no such issue with this, so maybe PHP's support can be improved (client-side cursor location allows the use of additional RecordSet features such as ->Sort() and ->Filter(), handy for porting ASP code that uses it instead of writing a dynamic query).

Any database and query should reproduce this, so please modify the 'reproduce code' appropriately (to point to your own database and use your own query).

Reproduce code:
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define("adLockReadOnly",1);
define("adOpenStatic",3);
define("adUseClient",3);

function simpleRS($conn,$q) {
	$rs = new COM('ADODB.RecordSet');
	$rs->ActiveConnection = $conn;
	$rs->LockType = adLockReadOnly;
	$rs->CursorLocation = adUseClient; //comment this line to remove the delay
	$rs->CursorType = adOpenStatic;
	$rs->Source = $q;
	echo 'opening... '; $rs->Open(); echo 'done';
	return $rs;
}

$dbconn = new COM('ADODB.Connection');
$dbconn->open('Provider=Microsoft.Jet.OLEDB.4.0; Data Source='. realpath('../../data/phpbb2.mdb'));
$rsUserList = simpleRS($dbconn,'SELECT * FROM phpbb_users');
$dbconn->close();

Expected result:
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opening... *almost instant* done

Actual result:
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opening... *delay* done