Louder and more sluggish than expected

The DS414slim Synology's too loud and too sluggish. Despite using the latest SSDs (Samsung Evo 850) is the performance of a gigabit switch with a Gigabit-capable host poor and average to Fast Ethernet Level. The Armada ARM core Marvell is apparently too weak and the SATA2 interfaces on that too slow. Even the desktop of an operating system modeled Web bothers me. I want a functional surface and no Klicki-Bunti window UI. But that's a matter of taste.
Who can come to terms with these shortcomings, to strike. For me it's another sobering in terms of NAS and I'll be back for a couple of years away from it.
Because I'd rather stay with my FreeBSD server, although that is also not silent, but at least fast and I have things in the file system and services the full range. (ZFS!)

Update: See also comment by Synology to this review. The compromise in the DS414slim is the size, ie the small (and therefore noisy) fan and the single-core CPU. Neure and larger models are in terms of performance do better.