How to Improve the preview quality in Photos

Is there some way to improve this situation. I already started to miss iPhoto but unfortunately, there will be no update by Apple in the future.

Are you using iCloud Photo Library?

With iCloud and "Optimize Storage" enabled, you will only seethe optimized versions, until the full sized original has been downloaded from iCloud.

Also, the generation of previews takes some time. It helps to keep Photos up and running over night to get all the background processing done after you imported new photos.

try rotating one and then un-roatating it - does that resolve this? If it does you can do that to a large group of selected photos all at once

LN

I found the image quality of preview(little pictures) of newly imported photos is extremely low comparing to iPhoto.

You mean the thumbnails you are seeing in the browser in Photos?

Photos may have problems to read and write the Photos Library, if it is so slow.

Is your Photos Library in the default location in the Pictures folder or on an external drive?

Have you tried to repair your Photos Library?

Important: You should back up your photo library before repairing your library.

• If Photos is open, choose Photos > Quit Photos.
• Press Option-Command and double-click the Photos icon in the Applications folder (or click the Photos icon in the Dock).The Repair Library window opens.
• Click Repair to rebuild your photo library.

No - but you can rotate and un-rotate a large group at once

Usually this will not be necessary - sometimes for the initial migration it is but future imports should be fine by the next day if you let the computer run

And you are welcome

LN

My photos library exist on an external drive

How is that EHD formatted and connected to your Mac?