TinyPng is a website that can help you reduce the size of your images, while maintaining the quality of the image. I recommend using this website for all your images. It will allow you to reduce your image size by 60-80% speeding up the load time of your website.

GtMetrix is one of the best tools if not the best tool to use, to help optimize your website. It rates your site it multiple areas showing where your website is fast and where it is slow, giving you an idea of what needs to be fixed or improved to have a faster website. They also give tips on what to do to speed up your website where it scored badly.