Question about compression type

[ghost]

Does the LZX compression make games run slower or is the compression just slow?

[Freaky]

It has slower compression and decompression, since it's a more complex algorithm - whether this translates to making a game load more slowly really just depends on the game and your hardware, but it's probably best to either avoid it or test it yourself if performance is a concern.

[Logic-Elliven]

As a general rule of thumb for improved performance, use:
Xpress4K on NVMe SSDs.
Xpress8K on SATA SSDs.
Xpress16K on HDDs.
LZX when size savings matter more than performance.

The why:
The slower the drive is; the more time your CPU has to decompress the data.
eg:
Lets say is takes 5 seconds to read the compressed data off the drive instead of 10.
If your CPU/Cores can decompress it in less than the 5 seconds saved; you gain performance.

The speed at which the cores can decompress data varies with hardware. (# of cores, frequency, L1 and 2 caches etc)

(But IIRC that rule of thumb comes from the days when 4 core CPUs were the norm.
The new 8+ core CPUs may have 'halved' that)

Another thing to keep in mind is that Xpress4K wites (and reads) the data in 4K blocks,
Xpress8K; 8K blocks
etc
So matching your File Allocation Unit Size (Sector Size) to those block sizes may improve performance on drives where most files are compressed with block sizes other than the std 4K.
Game drives for eg.