WordPress Themes, Plugins and HTML Templates › Forums › Dicot WordPress Theme › Performance problem: Images are resized in HTML or CSS › Re: Performance problem: Images are resized in HTML or CSS
We have discussed on this point and there is different school of thought on this.
Rescaling images is not a big issue on page speed if done with the combination of other strategies like usage of CDN, Site Cache etc.
However, if you want to get rid of scaled images, You can change the image sizes in the theme’s function file.
After changing the image dimensions in the theme’s functions file, you can use the Regenerate Thumbnails plugin and this will help you to generate images of exact size.