Quote:
Brian ..
can you compare CPU usage with only loudness on (without bass boost and deep bass protection) between 4096 and 2048 (latest beta)?
It's important

The test description is too vague, so I'm not completely sure I'm doing the same thing as you.
If I press Reset, then move the loudness slider up to 1.01, at 4096, I've got 33% for winamp.exe. At 2048, that drops to a mere 1-5%.
If that's what you're noticing, also notice that the "Take some shortcuts (CPU)" gets unchecked when you reset.
Turning on "Take some shortcuts (CPU)", brings 4096 down to 1-8%, and 2048 to < 1%.
Of course, this is dependent upon MP3 files as the source material. Percentages are higher for MP4 files.
CPU usage as reported for Winamp is also higher if you have the GUI up vs. in the tray. Bringing the GUI up, with the shortcuts enabled makes 4096 be 28-34% , and 2048 is at 2-4%.
If none of that is what you're asking about, then clarify what you have enabled / disabled or post a preset that you're testing this with so that we can be sure we're talking about exactly the same thing.