Optimize Images: Reduce image sizes using either GIF, PNG-8. or JPEG as the file formats. Make sure the size matches your usage and set the size for each page with the height and width. Do not make use of scaling, especially from larger to smaller images. The image result might look fine on screen but the file size will be the same. To truly take advantage of the smaller dimensions, use an image editing program and scale the image accordingly. The resulting file size will be smaller. It´s also important to experiment with compression for with all of these file formats. At some point you will obtain an acceptable compression with a minimum loss of quality. Experimentation is key.
5. Use GZIP compression: If your hosting company uses GZIP compression and deflation these can make a significant difference and speed up your site. It´s possible to reduce file sizes by 70% without losing image quality or video size. To see if your site uses GZIP already, here´s a test you can use.