In Hostinger, we know that Page Speed score greatly depends on image optimisation level. We support following tools in our all hPanel hosting and cPanel/WHM hosting plans to easily optimise your images via command line or plugins:

optipng
jpegoptim
jpegtran
gifsicle
libwebp-tools

These tools are enabled by default in user SSH session. If you want to execute these commands over PHP, you need to remove shell_exec() function from disabled_functions list in PHP configuration section.

Using following tools, as example, you can convert all your images to Google image format .WEBP using this tutorial: https://web.dev/codelab-serve-images-webp/

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