I made no modification to the game at all. I resurrected the 0.10.3b version of the game to make sure nothing was wrong on my system, and that was just as snappy as ever with getting in a game after character creation, saving, and loading a file, so I ended the experiment.
As an additional point, I looked at godot.2025-5-13_16.59.58.log. That file is 128MB in size and contains 1444049 lines of text, which I believe was from me gaming for a while in 0.11.0. Almost all of the log is the following three lines:
stack sid4115958980 not found
SCRIPT ERROR: Invalid call. Nonexistent function 'remove_effect' in base 'Nil'.
at: remove_effect (res://src/character/ch_dyn_stats.gd:266) - Invalid call. Nonexistent function 'remove_effect' in base 'Nil'.
although some were this:
stack sid2441563634 not found
SCRIPT ERROR: Invalid call. Nonexistent function 'remove_effect' in base 'Nil'.
at: remove_effect (res://src/character/ch_dyn_stats.gd:266) - Invalid call. Nonexistent function 'remove_effect' in base 'Nil'.
And earlier in the file a lot of this:
SCRIPT ERROR: Invalid get index 'sid4115958980' (on base: 'Dictionary').
at: clone_stack (res://src/core/effects_pool.gd:84) - Invalid get index 'sid4115958980' (on base: 'Dictionary').
SCRIPT ERROR: Invalid get index 'sid3522193546' (on base: 'Dictionary').
at: clone_stack (res://src/core/effects_pool.gd:84) - Invalid get index 'sid3522193546' (on base: 'Dictionary').
SCRIPT ERROR: Invalid get index 'sid4241686955' (on base: 'Dictionary').
at: clone_stack (res://src/core/effects_pool.gd:84) - Invalid get index 'sid4241686955' (on base: 'Dictionary').