Thanks for getting back at me.
I'm using the latest version available on the forum, I added the repo to receive updates automatically too.
Yes I'm using CIFS to my Synology so that might be the issue. New files shows up after I restart the app, normally.
Maybe NFS works better, I'll try to figure how to use this.
What is laggy is moving the window and searching, mainly. Also,it seems that linux doesn't know that MC is a player, because hardware play/pause trigger Amarok and all other music app but not MC, and (I don't know how it's called but...) clicking on the speaker icon in the notification bar doesn't show play/pause/artwork/etc, it's probaply a work-in-progress and not an issue per-say.
I didn't know about the benchmark, it's amazing! So here it is.
Running on a Samsung PRO SSD (the cache too, because I have 22000 audio files and I want it fast and responsive), using a quite outdated but good I7 2600k (waiting for AMD Ryzen to come out) on 8GB of RAM.
=== Running Benchmarks (please do not interrupt) ===
Running 'Math' benchmark...
Single-threaded integer math... 3.877 seconds
Single-threaded floating point math... 2.537 seconds
Multi-threaded integer math... 1.204 seconds
Multi-threaded mixed math... 0.830 seconds
Score: 2249
Running 'Image' benchmark...
Image creation / destruction... 0.375 seconds
Flood filling... 0.487 seconds
Direct copying... 0.779 seconds
Small renders... 1.312 seconds
Bilinear rendering... 1.016 seconds
Bicubic rendering... 0.581 seconds
Score: 4835
Running 'Database' benchmark...
Create database... 0.393 seconds
Populate database... 1.206 seconds
Save database... 0.172 seconds
Reload database... 0.063 seconds
Search database... 1.165 seconds
Sort database... 1.011 seconds
Group database... 0.669 seconds
Score: 4596
JRMark (version 22.0.63): 3893
Do MC is in special from time to time hahaha because as I said I'm in the demo version and Amarok is quite outdated (I still love that baby though) - Exchange rate from USD to CAD is high
Anyway, thanks for your inputs, maybe I'll switch back to Arch if it's faster (the updates are frustrating everything breaks rom time to time)