Changing from transposed to concert pitch in less than 6 minutes

This just happened. I was in engrave mode, Full score condensing layout and changed from transposed to concert pitch. I thought first that I have to kill Dorico but then I opened Activity Monitor app and application.log in Console. Dorico was not actually unresponsive and M3MAX pocessor usage showed aroung 600%. It did “something” for almost 6 minutes, After that- Dorico is working again.

2024-10-01 10:15:23.160 [info] Executing command: Edit.ChangeLayoutTransposition?LayoutTransposition=kScoreInC
2024-10-01 10:15:39.457 [info] Posting command (requested): File.AutoSave
2024-10-01 10:15:53.993 [info] ping response received in Dorico59C43F9358E044371B5ED69CAFF49EF54: from silk service
2024-10-01 10:16:39.044 [info] ping response received in Dorico59C43F9358E044371B5ED69CAFF49EF54: from silk service
2024-10-01 10:17:24.101 [info] ping response received in Dorico59C43F9358E044371B5ED69CAFF49EF54: from silk service
2024-10-01 10:18:09.148 [info] ping response received in Dorico59C43F9358E044371B5ED69CAFF49EF54: from silk service
2024-10-01 10:18:54.184 [info] ping response received in Dorico59C43F9358E044371B5ED69CAFF49EF54: from silk service
2024-10-01 10:19:39.238 [info] ping response received in Dorico59C43F9358E044371B5ED69CAFF49EF54: from silk service
2024-10-01 10:19:39.461 [info] Posting command (requested): File.AutoSave
2024-10-01 10:19:39.461 [info] Not adding duplicate command: File.AutoSave
2024-10-01 10:20:24.286 [info] ping response received in Dorico59C43F9358E044371B5ED69CAFF49EF54: from silk service
2024-10-01 10:21:09.337 [info] ping response received in Dorico59C43F9358E044371B5ED69CAFF49EF54: from silk service
2024-10-01 10:21:18.870 [info] addEventsForAudition() adding 1 events to buffer #:0
2024-10-01 10:21:18.898 [info] processAuditionEvents() - processed 1 events
2024-10-01 10:21:19.096 [info] notifyPostCommandExecute: Edit.ChangeLayoutTransposition?LayoutTransposition=kScoreInC (355940 ms)

I know that this again is a borderline case. I attach project statistics too.
For better readability I deleted all lines with zeroes.

Flows:	5
Players:	33
Pages:	229
Instruments:	43

Staves:	27
Systems:	356
Bars:	2440
Frames:	39088
Empty frames:	20947
Non-empty frames:	18141
Duration:	110′40″

Notes:	99034
Grace notes:	2
Rests:	18038
Bar rests:	20947
Tuplets:	3871

Clefs:	443
Octave lines:	15
Key signatures:	5
Time signatures:	249
Holds and pauses:	31

Dynamics:	14536
Slurs:	7509
Playing techniques:	953
Trills:	227
Glissandos:	586
Arpeggios:	269
Harp pedal changes:	129

Staff-attached text:	233
Immediate tempos:	184
Gradual tempos:	57
Lyrics:	7784
Rehearsal marks:	30
Comments:	3