Zen Cart is one of the most popular free shopping cart applications currently available.

Here are some tips on how to improve the performance of your Zen Cart shopping cart:

• Optimize your Zen Cart database.
•  Check your website using this online tool. It will give you valuable information on what modifications can be made in order to improve its performance.
•  Turn off Category Counts from the Zen Cart admin area > Config > My Store > Show Category Counts.
•  Install an additional optimization module such as this one.
•  Reduce the number of products shown on your main page.