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The easiest way depending on your theme would be to simply display:none on the product image class if you just want to remove the product images and then restyle to compensate.
Bare in mind that doing so will still load up the images in the background it just wont display them which obviously means there wont be any kind of page load increase, it will purely be cosmetic.
Next solution would be to add a remove action to the functions.php a bit like :
Both instances you will need to do extra styling to compensate for the lack of image, other style elements in your theme may move/break.
Another method would be to manually add customised templates to your theme folder, this method however may break things if WooCommerce do their updates meaning you would need to edit the customised templates if it did.