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Magento loads a lot of javascript libraries which increas load speed. Usually it increases by little but if you have custom template it may include additional files and take more time . But when you are attemting to minify or combine magento default javascript files it gives errors on the checkout page. If you still have issue with it please review compiled file which working for magento 1.6.x-1.9.x whith defualt files inclued at the article page.
 

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Source Models List
 
When you are doing custom magento extension with admin configuration sometimes you need to make custom drop down options. To create new custom dropdown menu you have to make source model, however magento by default have a lof of them. By clicking Read more you will find the most completed list of useful soruce models. It will help you save time and use existing source model with options instead of making new one.

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The extension adds feature on product page for configurable products. When customer select option of configurable product on product page, main image changes to the image from selected simple product.
This extension is useful for product which have colors or different options where you want to show to customer what he is buying.
Check out the demo video In the read more.

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In the magento Enterprise 1.13 issue with cleaning cache. When you clean it using admin panel cache doest not cleaned and cached files remain at the site.  The issue wasnt in the previous Magento Enterprise editions. For solving it was published path number 1498_EE_1.13.0.0_v1 . However if you not able to apply this patch you need make changes in filews below.