Objekty s preddefinovanymi property jsou pro Entity o polovinu datove narocne nez jedno pole + __get & __set. Objekt si totiz nemusi drzet klic.

benchmark.php

<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet">
<?php

function calculate_median($arr) {
	sort($arr);
	$count = count($arr); //total numbers in array
	$middleval = floor(($count-1)/2); // find the middle value, or the lowest middle value
	if($count % 2) { // odd number, middle is the median
		$median = $arr[$middleval];
	} else { // even number, calculate avg of 2 medians
		$low = $arr[$middleval];
		$high = $arr[$middleval+1];
		$median = (($low+$high)/2);
	}
	return $median;
}

function calculate_average($arr) {
	return array_sum($arr) / count($arr);
}

class Test1 {
	public $var1;
	public $var2;
	public $var3;
	public $var4;
	public $var5;
}

class Test2 {
	public $data = array();
}

$data = array();
$max = 20;
$cols = 5;
$objects = 2000;

function test($type, $cb) {
	global $data;
	$time = microtime(TRUE);
	$mem = memory_get_usage();
	$mem2 = $cb();
	$data['memory'][$type][] = $mem2 - $mem;
	$data['time'][$type][] = microtime(TRUE) - $time;
}

for ($i = 0; $i < $max; $i++) {
	test('property', function() use ($cols, $objects) {
		$c = array();
		for ($i = 0; $i < $objects; $i++) {
			$t = new Test1;
			for ($j = 1; $j <= $cols; $j++) {
				$t->{'var' . $j} = $j;
			} 
			$c[$i] = $t;
		}
		return memory_get_usage();
	});

	test('object array', function() use ($cols, $objects) {
		$c = array();
		for ($i = 0; $i < $objects; $i++) {
			$t = new Test2;
			for ($j = 1; $j <= $cols; $j++) {
				$t->data['var' . $j] = $j;
			} 
			$c[$i] = $t;
		}
		return memory_get_usage();
	});

	test('array', function() use ($cols, $objects) {
		$c = array();
		for ($i = 0; $i < $objects; $i++) {
			$t = array();
			for ($j = 1; $j <= $cols; $j++) {
				$t['var' . $j] = $j;
			} 
			$c[$i] = $t;
		}
		return memory_get_usage();
	});
}

?>
<table class="table table-striped table-hover">
<thead>
	<tr>
		<th></th>
		<th colspan="<?= count($data['memory']) ?>">memory</th>
		<th colspan="<?= count($data['time']) ?>">time</th>
	</tr>
	<tr>
		<th></th>
		<?php
			foreach ($data['memory'] as $type => $val) {
				echo '<th>' . $type . '</th>';
			}
			foreach ($data['time'] as $type => $val) {
				echo '<th>' . $type . '</th>';
			}
		?>
	</td>
</thead>
<tbody>
<?php
for ($i = 0; $i < $max; $i++) {
	echo '<tr><td>' . $i . '</td>';
	foreach ($data['memory'] as $val) {
		echo '<td>' . round($val[$i] / 1024 / 1024, 4) . ' MB</td>';
	}
	foreach ($data['time'] as $val) {
		echo '<td>' . round($val[$i] * 1024, 2) . ' ms</td>';
	}
	echo '</tr>';
}
?>
</tbody>
<tfooter>
	<tr class="success">
		<td>average</td>
		<?php
			foreach ($data['memory'] as $val) {
				echo '<td>' . round(calculate_average($val) / 1024 / 1024, 4) . ' MB</td>';
			}
			foreach ($data['time'] as $val) {
				echo '<td>' . round(calculate_average($val) * 1024, 2) . ' ms</td>';
			}
		?>
	</tr>
	<tr class="success">
		<td>median</td>
		<?php
			foreach ($data['memory'] as $val) {
				echo '<td>' . round(calculate_median($val) / 1024 / 1024, 4) . ' MB</td>';
			}
			foreach ($data['time'] as $val) {
				echo '<td>' . round(calculate_median($val) * 1024, 2) . ' ms</td>';
			}
		?>
	</tr>
</tfooter>
</table>

results

	memory 						time
	property	object array	array		property	object array	array	
0	0.6038 MB	1.305 MB	1.168 MB	16.89 ms	14.81 ms	13.14 ms
1	0.5726 MB	1.3051 MB	1.1677 MB	11.6 ms		17.17 ms	12.73 ms
2	0.5726 MB	1.3051 MB	1.1677 MB	13.07 ms	16.11 ms	14.97 ms
3	0.5726 MB	1.3051 MB	1.1678 MB	14.73 ms	14.52 ms	11.66 ms
4	0.5726 MB	1.3051 MB	1.1678 MB	13.86 ms	11.9 ms		10.18 ms
5	0.5726 MB	1.305 MB	1.1678 MB	11.82 ms	12.43 ms	10.83 ms
6	0.5727 MB	1.3051 MB	1.1678 MB	13.54 ms	14.25 ms	10.16 ms
7	0.5727 MB	1.3051 MB	1.1679 MB	14.46 ms	18.19 ms	11.55 ms
8	0.5727 MB	1.3051 MB	1.1679 MB	10.8 ms		12.4 ms		11.28 ms
9	0.5727 MB	1.3051 MB	1.1678 MB	13.81 ms	12.86 ms	12.66 ms
10	0.5727 MB	1.305 MB	1.1678 MB	16.34 ms	17.06 ms	13.54 ms
11	0.5727 MB	1.3051 MB	1.1678 MB	12.87 ms	16.13 ms	13.49 ms
12	0.5727 MB	1.3051 MB	1.1677 MB	13.59 ms	13.42 ms	13.08 ms
13	0.5727 MB	1.305 MB	1.1679 MB	11.58 ms	13.08 ms	11.24 ms
14	0.5727 MB	1.3051 MB	1.1678 MB	14.61 ms	13.56 ms	13.08 ms
15	0.5727 MB	1.305 MB	1.1679 MB	10.94 ms	13.01 ms	11.12 ms
16	0.5727 MB	1.3051 MB	1.1679 MB	11.31 ms	13.8 ms		10.92 ms
17	0.5727 MB	1.3051 MB	1.1678 MB	10.87 ms	11.67 ms	10.07 ms
18	0.5727 MB	1.305 MB	1.1678 MB	12.43 ms	12.96 ms	10.31 ms
19	0.5727 MB	1.3051 MB	1.1679 MB	10.69 ms	13.42 ms	11.34 ms
average	0.5742 MB	1.3051 MB	1.1678 MB	12.99 ms	14.14 ms	11.87 ms	
median 	0.5727 MB	1.3051 MB	1.1678 MB	12.97 ms	13.49 ms	11.45 ms