Possible reason

  • High Background Image Resolution
  • High Image Resolution in image group for image swatch
  • Activating pdf / svg output include
  • High Resolution / volume image uploaded by customer (Activating Original image upload + Cropped image in setting will double the volume)
  • Customer’s internet connection speed

Solution

  • Use less resolution background image and image swatch . Preferred 1000×1000 or less . If you want personalized image for printing the activate vector PDF or SVG from the settings so that you can scale it as large as you want and avoid large background file
  • If you want multiple image upload activate either cropped image or original image from settings so that the file size become half and does not exceed 20MB