Although it may be too soon to post a definitive appreciation for Slimjet's behavior on LinuxMint LMDE 3, just thought i'd briefly share a bit of what i'm seeing at present time.
Working with a very noisy HP EliteBook 8460p for 5 years now,
have tried many different things to make it quieter (Windows 10 helped a bit) but nothing compares to it working with LinuxMint LMDE 3.
It is as quiet as any new laptop can be!
Firefox and Vivaldi are noisy (make cpu fan do a workout) while Slimjet seems to show no impact to that regards!
Of course, i can't speak about Slimjet on other Linux distros, but in my setup (/ on SSD), everything is to my liking.
A happy SJ camper.
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Dual-booting with Win 10 64bit pro.