It’s also likely that the mSATA slot is bottlenecked since it runs at SATA II speeds while the 2.5 bay runs at SATA III speeds. This becomes noticeable with heavy swapping or flatpak updates. I found this out the hard way because I want my boot drive on my 256 GB mSATA instead of the 2 TB SSD that I use for media and backups.
It’s also likely that the mSATA slot is bottlenecked since it runs at SATA II speeds while the 2.5 bay runs at SATA III speeds. This becomes noticeable with heavy swapping or flatpak updates. I found this out the hard way because I want my boot drive on my 256 GB mSATA instead of the 2 TB SSD that I use for media and backups.