Too big images are charmful for user data transfer and experience so keep this in mind while changing them.
Check out this guideline to see how to optimize images - https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/image-optimization?hl=en
There's a lot of tools to compress or convert images
alias imgdim="sips -g pixelHeight -g pixelWidth $1"- useful on mac to check image dimensions- imagemagic
convert -resize 1280x old_image.jpg new_image.jpg- usefull to resize horizontaly keeping proportionsconvert old_image.png new_image.jpg- changes type compression of image
- image_optim - uses multiple tools to compress without losing quality.
Use https://github.com/flyerhzm/bullet to detect and correct them.