Recently I had to create a custom grid column renderer, to display clickable icons in an admin grid column.

The magento grid has built in functionality to call an action when a grid row is clicked.

This is great, but at times, you may need to prevent that default event from fireing.

A task I had to accomplish was to itterate all categories, and disable the categories which had no products enabled, or had no products assigned to them (filtering down the category tree, thus an anchor category, that has children with no products was also to be set disabled, filter all the way up the tree.

A frustrating issue appeared on a site I manage, where the related and upsell products appear as the same product.This is directly related to cache, as it appeared as soon as cache gets enabled.

Testing, I find that if I clear the BLOCK_HTML cache, then they work once, then stick to the first product. Clearly a cache issue

Magento's grid functionaly has a hidden, a d not well documented feature to allow you to trap double click events on a grid row.

A site I am managing recently came nder a massive DDOS attack from around the globe.

To limit the attack, I used fail2ban to setup a ban system to help mitigate the issue.

A recent botnet attack on a site I manage createded a massive amount of emails in the mail queue.

Magento generally logs events to either system.log or exception.log, but what if you want to do some additional action when those logs are written to? 

So you have an awesome, popular website,  be it e-commerce based, or just information based. No matter how awesome your site, one of the leading factors to break the awesomeness is site speed. Plainly put, if customers find the site loading time frustrating, they will move on to another site. 

So, how to improve your site performance?

One of the best ways will be to hook up with New Relic

It is possible to target mobile devices to load a seperate mobile theme. This method is becoming a bit 'old-school' since responsive themes are the 'new wave' of targetting all device types.