Comment to Photo Size
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Cover image should be big enough to be displayed on the whole page width, this is reason it loads a bit slow, you can reduce size of cover image, but it's not recommended.
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By default we resize it to 2000px width
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I'm more concerned with file size not px size. the file size remains way to big need to auto resize the file
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If more image size in px then it's more in kb. Also please note that for retina screens images are resized in 2x more resolution which cause images files to be up to 4x times more in kb.