# Performance

#### Enable 'PJPG' image format

If the original image format used in your store is PJPG, activate one of the options from the drop-down to display images accordingly. The current drop-down includes two options: "For all images" and "For all except products". Select the "Disable" option for images in a different format, such as PNG. Information about image formats can be found [<mark style="color:blue;">here</mark>](https://help.shopify.com/en/manual/online-store/images/theme-images#image-formats).

<mark style="color:orange;">**Note!**</mark> This option does not convert images to progressive JPG format and can be applied to images that already use this format by default.

#### Start for deferred sections

The number of content sections that load instantly can be set on the provided scale. Adjust the slider to specify a number between 0 and 50 sections that load at a time. The recommended value is 5, which is set by default in the theme settings. For more details about lazy loading, please refer to the following [<mark style="color:blue;">resource</mark>](https://developer.mozilla.org/en-US/docs/Web/Performance/Lazy_loading).