Theme Design Issues impacting page speed

Q1:Why wasn't the template designed to ensure optimal page speed? Q2:How do you set expiry date? Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network. Example: http://Website name/…es/simple-catch-pro/images/header-bg.jpg (expiration not specified) Q3:How to replace the images in the template with compressed versions? Optimize the following images to reduce their size by 9.8KiB (64% reduction). Compressing http://site name/…atch-pro/images/header-top-footer-bg.jpg could save 6.3KiB (79% reduction). Compressing http://site name/…es/simple-catch-pro/images/header-bg.jpg could save 3.5KiB (49% reduction)