How to use cache in OpenMage / Magento 1.x to speed things up

Mechanism: cache in model

First, save the cache

// app\code\core\Mage\Core\Model\App.php Mage_Core_Model_App
/**
 * Saving cache data
 *
 * @param   mixed $data
 * @param   string $id
 * @param   array $tags
 * @param null|false|int ...

validation.js

/*
* Really easy field validation with Prototype
* http://tetlaw.id.au/view/javascript/really-easy-field-validation
* Andrew Tetlaw
* Version 1.5.4.1 (2007-01-05)
*
* Copyright (c) 2007 Andrew Tetlaw
* Permission is hereby granted, free of c...

When there is no payment methods on onepage checkout page

Add new input type in product custom options

custom module productcoption
config.xml

<config>
    <modules>
        <Somemod_ProductCoption>
            <version>0.0.1</version>
        </Somemod_ProductCoption>
    </modules>
    <global> 
        <resources>
            <productcopti...

Check if the current page is homepage

<?php if(!Mage::getBlockSingleton('page/html_header')->getIsHomePage()): ?>
    <p class="note-msg"><?php echo $this->__('There are no products matching the selection.') ?></p>
<?php endif ?>

nginx config

Adminhtml JSON Response Body

HTML

public function visibleProductsAction()
{
    $this->getResponse()->setBody(
        $this->getLayout()->createBlock('module/adminhtml_block_type')->toHtml()
    );
}

Generic Block:

$block = $this->getLayout()->createBloc...

Add Custom API

Define the API in the custom module app\code\local\{vendor}\{module}\etc\api.xml:

<config>
    <api>
        <resources>
            <member translate="title" module="benefit">
                <model>benefit/api_member</model>
          ...

Filter EAV collection

condA AND (cond1 OR cond2 OR cond3)

$cincId = $session->getCustomerId();
$attributes = array( 
    array('attribute'=>'mc_by', 'eq'=>$clinicId), 
    array('attribute'=>'mc_lb_by', 'eq'=>$clinicId),
    array('attribute'=>'mc...

Prototype.js Removal

Related cards:

Mechanism: cache in model

First, save the cache

HTML

condA AND (cond1 OR cond2 OR cond3)