Since upgrading to 7.x (now on 7.2), my session takes about 1.5 mins to load. New sessions do not take this long. But, a session I have been working on and off for about a year takes a long time to load. Was not an issue on 6.9, just started after upgrading to 7.x.
Here is my log file, and you can see a long stall in opening the application:
2022-12-29T18:56:26 [INFO]: CoreAudioBackend: adjusted output channel count to match device.
2022-12-29T18:56:27 [INFO]: Scanning folders for bundled LV2s: /Applications/Ardour7.app/Contents/lib/LV2
2022-12-29T18:56:28 [INFO]: harvid version: 900
2022-12-29T18:56:29 [INFO]: Loading menus from /Applications/Ardour7.app/Contents/Resources/ardour.menus
2022-12-29T18:56:59 [ERROR]: ardour::connect: Invalid Source port: (ardour:)
2022-12-29T18:57:03 [INFO]: Loading user ui scripts file /Users/me/Library/Preferences/Ardour7/ui_scripts
2022-12-29T18:57:03 [INFO]: Loading plugin order file /Users/me/Library/Preferences/Ardour7/plugin_metadata/plugin_order
2022-12-29T18:57:48 [INFO]: Loading history from /Users/me/Recording/BNFJ_Album/BNFJ_Album_MIXTEST-12262022.history
2022-12-29T18:57:48 [INFO]: Could not reconstitute MementoCommand from XMLNode. object type = 14AutomationLine id = 5404772
2022-12-29T18:57:48 [INFO]: Could not reconstitute MementoCommand from XMLNode. object type = 14AutomationLine id = 5404772
2022-12-29T18:57:48 [INFO]: Could not reconstitute MementoCommand from XMLNode. object type = 14AutomationLine id = 5404772
2022-12-29T18:57:48 [INFO]: Could not reconstitute MementoCommand from XMLNode. object type = 14AutomationLine id = 5404772
2022-12-29T18:57:48 [INFO]: Could not reconstitute MementoCommand from XMLNode. object type = 14AutomationLine id = 5404772
2022-12-29T18:57:48 [INFO]: Could not reconstitute MementoCommand from XMLNode. object type = 14AutomationLine id = 5404772