Question On Dynamic & True Image Resizing.

Preface: I'm allowing users to upload images from their phones, but the images will be no bigger than 160 x 160 square in the app, so my primary goal is app speed and secondarily bandwidth and my cost.

1. On Dynamic resizing - When Xano dynamically resizes a 2MB phone image, does that mean the image is actually loaded, and then resized, and then displayed, so, I'm guessing for the sake of bandwidth it would be less, but to the end user the actual processing time is longer than just displaying the actual image resized through the dimensions? Is that correct? is it minimal to the point it wouldn't matter? what if there are 10 2mb images resized to 160x160 on screen at the time?

2. On actual image resizing on upload for file storage - It seems like tinypng is the best option for this, so I'm probably going to give this method a shot, but in the meantime would there be any reason I couldn't just manually do a daily pull of new images to my local drive and manually convert them and replace them on the Xano server?

Thanks for any advice!