Sounds removed by Asset Manager stay in memory

[nimeratus]

The decompressed sound data stays in target.sprite.soundBank.soundPlayers["M6e6_ssH0+uu??Ufvvil"].buffer even after the sound ended and was removed using the "delete sound" block.

Edit: seems like it also happens when removing a sound using the editor, which also happens in vanilla Scratch

[penta-quark-neutro]

According to some tests I ran, it's true.

Even deleting from the editor, the data remains.

But manual deletion seems to remove it completely; it appears to be the only reference that stores that data.
I recommend checking it in the web version. I did the tests in the desktop program, and monitoring RAM usage is a bit more difficult, but it seemed to work when manually deleting the reference to a large audio file reduced RAM usage from 660MB to 640MB.
In a more thorough test, RAM usage dropped from 1001MB to 300MB.

[LegoBrainBiker]

the extension calls the following function (from scratch-vm):

    /**
     * Delete a sound by index.
     * @param {number} index Sound index to be deleted
     * @return {object} The deleted sound object, or null if no sound was deleted.
     */
    deleteSound (index) {
        // Make sure the sound index is not out of bounds
        if (index < 0 || index >= this.sprite.sounds.length) {
            return null;
        }
        // Delete the sound at the given index
        const deletedSound = this.sprite.sounds.splice(index, 1)[0];
        this.runtime.requestTargetsUpdate(this);
        return deletedSound;
    }

soundPlayers are from scratch-audio, however it doesn't even have a delete function. to fix this, we could to add a deleteSoundPlayer function in soundbank, and call that in delete sound like this:

this.sprite.soundBank.deleteSoundPlayer(deletedSound.soundId);

[penta-quark-neutro]

I have to say thank you for this; it was very useful information.
I modified one of my games, and now it uses 2GB of RAM instead of the 6GB it used before.