THis is really weird. I just tried this on a fresh install on a Pi3+, definitely no waiting for the analysis. Then I transferred my testing library with 450MB of various files, folders and whatnot over, tried again, and now I seem to see a wait. It doesn't make any sense at all so far.
Case in point, fresh:
2021-03-12 14:42:20,508 - octoprint.filemanager.analysis - INFO - Starting analysis of local:trispinner_prusa.gcode
2021-03-12 14:42:20,510 - octoprint.filemanager.analysis - INFO - Invoking analysis command: /home/pi/oprint/bin/python3 -m octoprint analysis gcode --speed-x=6000 --speed-y=6000 --max-t=10 --throttle=0.0 --throttle-lines=100 /home/pi/.octoprint/uploads/trispinner_prusa.gcode
2021-03-12 14:42:20,537 - tornado.access - INFO - 201 POST /api/files/local (::ffff:192.168.1.3) 1526.08ms
2021-03-12 14:42:20,551 - tornado.access - INFO - 200 POST /api/files/local (::ffff:192.168.1.3) 1540.22ms
2021-03-12 14:42:20,641 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads',base='',force_refresh=False) took 29.56ms
2021-03-12 14:42:20,674 - octoprint.server.api.files.timings - DEBUG - octoprint.server.api.files._getFileList('local',filter=False,recursive=True,allow_from_cache=True) took 63.53ms
2021-03-12 14:42:20,674 - octoprint.server.api.files.timings - DEBUG - octoprint.server.api.files._getFileList('sdcard',) took 0.03ms
2021-03-12 14:42:20,741 - tornado.access - INFO - 200 GET /api/files?recursive=true (::ffff:192.168.1.3) 149.74ms
2021-03-12 14:42:31,361 - octoprint.filemanager.analysis - INFO - Analysis of entry local:trispinner_prusa.gcode finished, needed 10.85s
2021-03-12 14:42:31,397 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads',base='',force_refresh=False) took 4.85ms
2021-03-12 14:42:31,400 - octoprint.server.api.files.timings - DEBUG - octoprint.server.api.files._getFileList('local',filter=False,recursive=True,allow_from_cache=True) took 8.85ms
2021-03-12 14:42:31,406 - octoprint.server.api.files.timings - DEBUG - octoprint.server.api.files._getFileList('sdcard',) took 0.02ms
2021-03-12 14:42:31,415 - tornado.access - INFO - 200 GET /api/files?recursive=true (::ffff:192.168.1.3) 31.23ms
And with 450MB library:
2021-03-12 15:00:19,293 - tornado.access - INFO - 201 POST /api/files/local (::ffff:192.168.1.3) 3297.66ms
2021-03-12 15:00:19,313 - tornado.access - INFO - 200 POST /api/files/local (::ffff:192.168.1.3) 3318.07ms
2021-03-12 15:00:30,723 - octoprint.filemanager.analysis - INFO - Analysis of entry local:pia/trispinner_prusa.gcode finished, needed 11.49s
2021-03-12 15:00:31,373 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/pia',base='pia/',force_refresh=False) took 1.89ms
2021-03-12 15:00:31,376 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/biqu_bx',base='biqu_bx/',force_refresh=False) took 2.06ms
2021-03-12 15:00:31,381 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/issue_2773',base='test/issue_2773/',force_refresh=False) took 0.24ms
2021-03-12 15:00:31,384 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/issue_2629',base='test/issue_2629/',force_refresh=False) took 1.87ms
2021-03-12 15:00:31,387 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/gcodeviewer_lag',base='test/gcodeviewer_lag/',force_refresh=False) took 1.94ms
2021-03-12 15:00:31,389 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/issue_3930',base='test/issue_3930/',force_refresh=False) took 1.95ms
2021-03-12 15:00:31,392 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/issue_3387',base='test/issue_3387/',force_refresh=False) took 1.92ms
2021-03-12 15:00:31,394 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/issue_3437',base='test/issue_3437/',force_refresh=False) took 1.94ms
2021-03-12 15:00:31,397 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/foo',base='test/foo/',force_refresh=False) took 1.90ms
2021-03-12 15:00:31,401 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/issue_3541/Folder_1/Sub_Folder_1',base='test/issue_3541/Folder_1/Sub_Folder_1/',force_refresh=False) took 0.20ms
2021-03-12 15:00:31,403 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/issue_3541/Folder_1/Sub_Folder_2',base='test/issue_3541/Folder_1/Sub_Folder_2/',force_refresh=False) took 1.87ms
2021-03-12 15:00:31,404 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/issue_3541/Folder_1',base='test/issue_3541/Folder_1/',force_refresh=False) took 3.84ms
2021-03-12 15:00:31,404 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/issue_3541',base='test/issue_3541/',force_refresh=False) took 6.73ms
2021-03-12 15:00:31,409 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test/issue_3057',base='test/issue_3057/',force_refresh=False) took 4.46ms
2021-03-12 15:00:31,409 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/test',base='test/',force_refresh=False) took 32.71ms
2021-03-12 15:00:31,412 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/h2',base='h2/',force_refresh=False) took 1.99ms
2021-03-12 15:00:31,414 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/foo',base='foo/',force_refresh=False) took 1.74ms
2021-03-12 15:00:31,418 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/haussge/blurb',base='haussge/blurb/',force_refresh=False) took 0.18ms
2021-03-12 15:00:31,422 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/haussge/test/wolf_face',base='haussge/test/wolf_face/',force_refresh=False) took 0.18ms
2021-03-12 15:00:31,424 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/haussge/test/blorb',base='haussge/test/blorb/',force_refresh=False) took 1.83ms
2021-03-12 15:00:31,426 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/haussge/test/bloorb',base='haussge/test/bloorb/',force_refresh=False) took 1.77ms
2021-03-12 15:00:31,429 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/haussge/test/dog_face',base='haussge/test/dog_face/',force_refresh=False) took 1.63ms
2021-03-12 15:00:31,431 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/haussge/test/test',base='haussge/test/test/',force_refresh=False) took 1.68ms
2021-03-12 15:00:31,433 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/haussge/test/blarb',base='haussge/test/blarb/',force_refresh=False) took 1.79ms
2021-03-12 15:00:31,434 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/haussge/test',base='haussge/test/',force_refresh=False) took 15.03ms
2021-03-12 15:00:31,434 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/haussge',base='haussge/',force_refresh=False) took 19.28ms
2021-03-12 15:00:31,439 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads/another_test',base='another_test/',force_refresh=False) took 4.14ms
2021-03-12 15:00:31,443 - octoprint.filemanager.storage.timings - DEBUG - octoprint.filemanager.storage._list_folder(<octoprint.filemanager.storage.LocalFileStorage object at 0x726fe030>,'/home/pi/.octoprint/uploads',base='',force_refresh=False) took 10403.85ms
2021-03-12 15:00:31,505 - octoprint.server.api.files.timings - DEBUG - octoprint.server.api.files._getFileList('local',filter=False,recursive=True,allow_from_cache=True) took 11162.68ms
2021-03-12 15:00:31,506 - octoprint.server.api.files.timings - DEBUG - octoprint.server.api.files._getFileList('sdcard',) took 0.03ms
2021-03-12 15:00:31,535 - tornado.access - INFO - 200 GET /api/files?recursive=true (::ffff:192.168.1.3) 12196.06ms