You’re probably used to using this online retailer to buy everything from the best headphones to dog food, so why not add some free music to your shopping list? Believe it or not, Amazon has a massive assortment of thousands of free tunes available via its digital music arm, allowing you to pick through everything from obscure indie and classical music to hits by the Foo Fighters (whose songs Saint Cecelia and Iron Rooster were available for free download on the service, last we checked). Checkout is quick and painless, and it works just like buying a song that costs money on Amazon, sans payment. Simply add a song to your shopping cart, check out, and the tunes are yours.

But, the devil is in the details. At the end of the day, Shopify seems like a more laser-focused solution. Everything that Shopify offers is geared at making your online store more functional and easy to use. With WooCommerce, the platform is extremely feature-rich and it doesn't lack any specific eCommerce features. However, it's still an add-on to WordPress, making it more complex to configure.
OpenCart. OpenCart could be a great choice for small businesses without tech savvy employees. OpenCart is very simple to install and start using. It runs very quickly using simple code. OpenCart allows you to set advanced user privileges and separate access for users and groups. A simple code also has drawbacks; often for sale extensions and themes may not be up-to-date with security standards. 
Load time is a pretty straightforward indicator of how fast your site is. Simply put, it’s the measure of how long it takes a page (or pages) on your site to fully load. A slow site is a killer in ecommerce – potential customers run away from slow sites, and as we mentioned earlier, each second you gain in site loading speed translates directly into sales gained.
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