Hello Sir,
In shopify we need to optimize website image to adobe 2000 jpeg and png version, and other needed changes I will make into your website, I will make all the changes and suggest my team to make the java minification, css modification etc.
the total time required is totally depends on no. of products listed into website and no. of category because we have make changes in image format and all.
I can make all this done as soon as possible.
Regards!
Sam