MC26 doesn't get sluggish - it is sluggish. Opens immediately but doesn't respond to scrolling or playing for seconds. Play, pause and track change are noticeably not snappy ever.
This is on an octo-core 3 GHz I7-9700 machine with 32 GB of RAM and large drives nowhere near full.
EFI, Boot & LUKS/LVM System are on separate partitions on a 256 GB NVMe drive.
Root, Root 2 (for future OS tryout), Home, Tmp, Var & Swap (@ 2X RAM) are on separate LVM/LUKS partitions on a second NVMe 1 TB drive. Both NVMe drives have 10 GB unallocated space.
Largely FLAC with some mp3 music files are on a 10 TB WD Red rotating rust drive.
I have Conky running on the desktop and never exceed 15% of system resources - memory or processor. This iron is loafing with no noticeable issues on any other programs.