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Spinning rainbow wheel whenever I touch MC29 for Mac

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Domi62:
Hello Team, the issue had appeared as from MC 27 but it has gotten only worse and now culminates since MC29: trying to grab the MC window to move it, clicking on an album, clicking on a menu, hitting play,... any action results in first about 5 seconds of spinning rainbow wheel. I run MC 29 latest on an iMac late 2014 (core i7, 32GB memory, Big Sur 11.6.5). I tried switching off Retina mode and erasing the plist, it did not help.
MC is now so sluggish I am considering fully migrating my listening habits to Roon, which is perfectly responding. Apple Music and Audirvana (I installed a trial version) also work swiftly. Note I have a very large music library (301k files, all on hard disks directly linked to the Mac, not on network or NAS).

Help much appreciated!

I copy the performance test, system info and a log:
=== Tests de performance en cours (ne pas interrompre) ===

Test 'Math' en cours...
    Calcul entier monotâche... 3.711 secondes
    Calcul à virgule flottante monotâche... 2.250 secondes
    Calcul entier multitâche... 1.048 secondes
    Calcul mixte multitâche... 0.694 secondes
Score: 2467

Test 'Image' en cours...
    Création / destruction d'image... 1.190 secondes
    Remplissage... 0.377 secondes
    Copie directe... 0.547 secondes
    Petits rendus... 0.883 secondes
    Analyse bilinéaire... 0.681 secondes
    Analyse bicubique... 1.302 secondes
Score: 4417

Test 'Base de données' en cours...
    Créer une base de données... 0.217 secondes
    Peupler la base de données... 1.009 secondes
    Enregistrer la base de données... 0.162 secondes
    Recharger la base de données... 0.060 secondes
    Rechercher dans la base de données... 1.416 secondes
    Trier la base de données... 0.709 secondes
    Rassembler la base de données... 0.710 secondes
Score: 5021

JRMark (version 29.0.25 64 bit): 3968

System info:
Médiathèque
    Nombre total de fichiers: 302,694
    Fichiers audio: 301,702
    Fichiers image: 94
    Fichiers vidéo: 0
    Autres fichiers: 898
    Artistes: 13,533
    Albums: 9,501
    Genres: 32
    Année: 77
    Listes de lecture: 118
    Most Played Tracks: Science Fiction;The World's First Ever Monster Truck Front Flip Explicit;Star Treatment;One Point Perspective;Four Out Of Five
    Most Played Albums: Tranquility Base Hotel & Casino;No Limits!;As If;Thr!!!Er;Singles Nov 2019
Exécution
    Construction des vignettes: 100% (302694 of 302694)
    Audio analyzed (audio files): 100% (301702 of 301702)
    Audio analyzed (video files): 0% (0 of 0)
Processus en arrière-plan
    Aucun processus actuellement en cours
Alimentation
    Aucune entrée affectant l'état du système
Drive Info
    Time for 256 MB file on library / rip drive () to make / read: 0.359 / 0.036 seconds
Media Center
    Version: 29.0.25 registered
    Chemin d'installation: /Applications/Media Center 29.app/Contents/MacOS/
    Modules d'interface:
    JRMark: 3968 (version 29.0.25)
    Program run time: 2.5 heures
    Mémoire utilisée:
    Traitements utilisées:
    Screen coordinates: Native
Informations avancées du système
    Memory & CPU
        CPU features: MMX, SSE2, SSE3, SSSE3, SSE4.1
        Total Logical Cores: 8
    Operating System
        Mac OS X 11.6 Big Sur (Intel)

Juke:
I can concur with the spinning beach ball issue.  It happens all too frequently when I am double clicking different tracks to play.  I can go about 4 or 5 tracks with no problem, but then MC29 hangs for 10 seconds or more - sometimes exhibiting the spinning beach ball.  Usually it will eventually start playing the selected track, but occasionally MC needs to be forcibly killed.  I have MacBook Pro (13-inch, 2017, Two Thunderbolt 3 ports), Processor 2.3 GHz Dual-Core Intel Core i5, Memory 16 GB 2133 MHz LPDDR3 and running Media Center 29.0.23 (Intel) on macOS Monterey Version 12.2.1

bob:
The only thing I can see in the log that looks interesting is scanning for new files to import.
Try turning off auto-import (remove the auto-import folders) and see if that changes things.

Domi62:
Hello Bob, Thanks for responding. I took half the step you suggested by removing the auto-import folders for my ALAC and mp3 collections (which are mirrors of my source FLAC collection). I only left the FLAC library in the auto-import list, which is about 115000 tracks. This has considerably improved the responsiveness of MC. It still hangs and has to be killed and re-started once or twice a day, like Juke experiences, and the dreaded spinning wheel also appears once in a while, but much less than before. Still, MC, for an expensive paid program, feels way too sluggish: it is now "kind of useable" but certainly not "swift and fun to use". I would encourage the development team to keep working on making MC faster and less prone to freezing on Intel Macs.

EnglishTiger:
When AutoImport is switched on MC is checking to see if there are any New Files/Tracks, in the folders being monitored, to be Imported at Startup and thence once every 120 mins. 
If you are not constantly adding new files/tracks then switching the thing off will help improve the Startup Times.

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