[thaumasiotes]

I see two mentions of "increased speed" in that article:

1. Increased installation speed. This one's obvious; less data takes less time to install. This is mentioned in your parent comment.

2. "But compression isn't just about saving disk space. It's also a classic example of trading CPU cycles for decreased I/O latency and bandwidth. Over the past few decades, CPU performance has gotten better (and computing resources more plentiful—more on that later) at a much faster rate than disk performance has increased. Modern hard disk seek times and rotational delays are still measured in milliseconds. In one millisecond, a 2 GHz CPU goes through two million cycles. And then, of course, there's still the actual data transfer time to consider. [...] Given the almost comical glut of CPU resources on a modern multi-core Mac under normal use, the total time needed to transfer a compressed payload from the disk and use the CPU to decompress its contents into memory will still usually be far less than the time it'd take to transfer the data in uncompressed form."

It's an interesting point, but seek times and rotational delays don't apply to SSDs. This is kind of an uneasy comparison to draw with "I hate that Chromium’s snap takes more than 10 seconds to load on cold boot on a freaking SSD".

[microtonal]

It's an interesting point, but seek times and rotational delays don't apply to SSDs.

There is another reason to do compression on SSDs: you have more storage free and thus less write amplification and your SSDs will last longer. In fact some SSD controllers (e.g. SandForce controllers used to do this) compress data to reduce write amplification.

https://en.wikipedia.org/wiki/SandForce#Technology

The trick that they applied is that say, if you had a 500GB SSD and you stored 400GB uncompressed which the controller compressed to 200GB, the drive would still report only having 100GB free, giving it an ample 300GB of free blocks, thus greatly reducing write amplification.

(Of course, the benefit of controller-level compression is gone with full-disk encryption. But I guess FDE was less popular when SandForce SSDs became popular.)