unless you’re picking a slow compressor that’s not true at all

Original size | 100 GB
Compressed size | 47.8 GB (2.091 ratio)
Transfer speed | 1 Gbps (125 MB/s)
Original transfer time | 100 GB / 125 MB/s = 800 seconds
Compressed transfer time | 47.8 GB / 125 MB/s = 382.4 seconds

Compressor | Snappy
Compression ratio | 2.091 ratio
Compression speed | 565 MB/s
Decompression speed | 1950 MB/s
Compression time | 100 GB / 565 MB/s = 177 seconds
Decompression time | 47.8 GB / 1950 MB/s = 24.5 seconds

Transfer time w/o compression | 800 seconds
Transfer time with compression | 177 + 382.4 + 24.5 = 584.9 seconds