How to streamline this (rather large) MySQL query in PHP - php

Question

I thought I was pretty good at this sort of thing but...
I have the following query from a customer table that is about 8,500 rows and an address table that is about the same number of rows.
This query takes about 10 seconds to complete and I can't figure how to get it to milliseconds.
What am I doing wrong?
<select>
<option value=""></option>
<?php // get the customers
$sql = "
SELECT `cust`.`custid`, `cust`.`custname`, `cust`.`custactive`, `address`.`addtype`, `address`.`address1`, `address`.`addcity`, `address`.`addstate`
FROM `cust`
LEFT Join `address`
ON `cust`.`custid` = `address`.`addcustid`
and `address`.`addtype` = 'b'
WHERE `cust`.`custactive` = 'y'"
;
$result = mysqli_query($con,$sql) or die('Query failed: Could not get list of CLIENTS: ' . mysqli_error($con)); // query
while ($row = mysqli_fetch_array($result)) {
$custid = $row['custid'];
$space="";
$endingspaces = 4-(2*strlen($prodid));
for($count=1; $count<$endingspaces; $count++){
$space .=" ";
}
$custid = $row['custid'];
$custname = substr($row['custname'],0,15);
$address1 = substr($row['address1'],0,15);
$addcity = substr($row['addcity'],0,15);
$addstate = $row['addstate'];
print "<option value=\"$custid\">$custid: $space$custname, $address1, $addcity, $addstate</option>";
}
?>
</select>
DDL:
CREATE TABLE `cust` (
`custid` int(11) DEFAULT NULL,
`custname` varchar(45) DEFAULT NULL,
`custactive` varchar(255) DEFAULT NULL,
`custcreated` varchar(255) DEFAULT NULL,
`custmodified` varchar(255) DEFAULT NULL,
`cust_dataease_custid` int(11) DEFAULT NULL,
`custtype` varchar(5) DEFAULT NULL,
`custrep` int(11) DEFAULT NULL,
`custsource` varchar(5) DEFAULT NULL,
`custdiscount` decimal(65,30) DEFAULT NULL,
`custrepcomm` varchar(255) DEFAULT NULL,
`custsurcharge` varchar(255) DEFAULT NULL,
`custterms` varchar(12) DEFAULT NULL,
`custups` varchar(255) DEFAULT NULL,
`custnotes` varchar(255) DEFAULT NULL,
`custbilldif` varchar(5) DEFAULT NULL,
UNIQUE KEY `custid` (`custid`),
KEY `cust_dataease_custid_idx` (`cust_dataease_custid`),
KEY `custrep_idx` (`custrep`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
CREATE TABLE `address` (
`addid` int(11) unsigned NOT NULL AUTO_INCREMENT,
`addcustid` int(11) unsigned NOT NULL,
`addname` varchar(200) DEFAULT NULL,
`addtype` enum('b','s') NOT NULL DEFAULT 'b',
`address1` varchar(150) NOT NULL,
`address2` varchar(150) DEFAULT NULL,
`addcity` varchar(150) DEFAULT NULL,
`addstate` varchar(150) DEFAULT NULL,
`addstateother` varchar(150) DEFAULT NULL,
`addzip` varchar(150) DEFAULT NULL,
`addcountry` varchar(150) DEFAULT NULL,
`addnote` tinyblob,
PRIMARY KEY (`addid`),
KEY `add_cust_id_idx` (`addcustid`)
) ENGINE=InnoDB AUTO_INCREMENT=13037 DEFAULT CHARSET=utf8

Answer 1

John Green got me to thinking about the way information was being sent to and from the server, which led me to find the problem. Thanks John.
This is how I fixed it: Apparently, when my loop was iterating, it was "printing" each of the 8500 OPTION lines, which action (i didn't know), is a server-client interaction. So for each row, the server and browser had to have a conversation, which slowed everything down.
I fixed it by having the server compile the entire SELECT box on the server side, including the opening SELECT tags and interacting with the browser once through echoing my "add-to" variable: $select_box.
Now it takes like 1.2 seconds. I can live with that.
Thanks everyone for helping me chase this rabbit.
<?php // get the products
$select_box = "<select name=\"customer\" id=\"customer\" onChange=\"getcustinfo();\" data-placeholder=\"Choose a Customer\" class=\"chosen-select\" style=\"width:227px;\" tabindex=\"1\">
<option value=\"\"></option>";
$sql = "
SELECT *
FROM `cust`
LEFT Join `address`
ON `cust`.`custid` = `address`.`addcustid`
and `address`.`addtype` = 'b'
WHERE `cust`.`custactive` = 'y'"
;
$result = mysqli_query($con,$sql) or die('Query failed: Could not get list of CLIENTS: ' . mysqli_error($con)); // query
while ($row = mysqli_fetch_array($result)) {
foreach ($row as $key => $value){ ${$key} = $value; }
$space="";
$custname = substr($row['custname'],0,15);
$address1 = substr($row['address1'],0,15);
$addcity = substr($row['addcity'],0,15);
$select_box .= "<option value=\"$custid\">$custid: $space$custname, $address1, $addcity, $addstate</option>";
}
$select_box .="</select>";
echo $select_box;
?>