Image 1. Upload:
Original quality
Original size (5000x3000px)
Filesize: 9.8 MB

Squarespace filesize:
fullscreen: 760 KB
quarter screen: 122 KB

Image 2. Upload:
60% quality
Original size
Filesize: 2.4 MB

Squarespace filesize:
fullscreen: 733 KB
quarter screen: 94 KB

Image 3. Upload:
60% quality
2000px size
Filesize: 596 KB

Squarespace filesize:
fullscreen: 510 KB
quarter screen: 95 KB

Image 4. Upload:
60% quality
2000px size
+ TinyJpg.com compression
Filesize: 354 KB

Squarespace filesize:
fullscreen: 356 KB
quarter screen: 88 KB