photoshop - Optimizing image for full page desktop with supports for responsive design -

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recently have requested 1 of friend design website non profit charitable organization. friend developed using html , bootstrap. delivered website. found website loading slow.

the website has full page image slider in homepage. 3 images can changed using slider. image size, resolution may issue.

please refer below image link image details

my friend sick , hospitalised. not time me ask modify images. have photo shop. need or share links can myself. here area need help.

1) per image, image sizes 1900 x 920 pixels. resolutions 300 , 72 dpi. given current desktop/laptop displays resolution , cellular phone, resolution should save, should size?

2) if need higher resolution (as 1 of image 72 dpi) can increase resolution higher resolution in photoshop? images natural agricultural farm.

3) how reduce file size without affecting image dimensions (width x height)? guidance? tutorial links? appreciate :)

4) replace 1 image s2.jpg image took using digital camera. image size replacement image size should in photoshop optimize image?

thank , appreciate inputs :)

1). size i'd use 1500x1000. perfect size sliders.
2). can change dpi http://convert.town/image-dpi
3). reduce file size without changing resolution, i'd recommend using http://www.jpegmini.com/
4). when in photoshop image open, go image> image size> , change resolution 1500x1000.


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