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CPU, not so much. Did not notice any difference at all unchecking the options.
Strange. I just did a test of version 6.21 vs. the latest BETA, and with these options all turned off the difference is less than 1% on my system. If I turn them on though, the difference is about 9%. This is measured with the FM Extreme Europe preset.
I've also done a measurement with your own webradio preset (built-in), and there's no difference there either (I don't even have to change the settings, defaults already turn the protection off if there's no pre-emphasis).
Can you tell me what you are testing exactly, or try again to make sure? The *very* small difference (~ 1%) indicates to me that the program isn't doing anything different (and that's also what I expect based on the code).