If your gallery thumbnails appear blurry or if your gallery page is loading too slowly, changing the quality of your thumbnails can help in either case.
Open Covet.pics and click Moderate on the gallery you want to edit
Click Customize and Embed Gallery in the top right corner
Select the Gallery Layout tab
Under Photo dimensions, change the drop down box from Automatic to your selected setting
- Thumbnail or Low will help increase your gallery page's speed but decrease the quality of the thumbnail
- Standard or High will increase the quality of your thumbnail but may affect your gallery page's speed.
Once selected, click Save Changes
NOTE: The High setting is only available for Manual Uploads, not for Instagram posts. Instagram only returns images at 640px and therefore the Standard setting should be used for them.
You can try testing site speed before and after using a tool such as Pingdom. Make sure you input the specific page you are testing ie. www.test.com/gallery