Itunes 11 Buffer Size settings.

No.

First delete any files that start with 'com.apple.itunes.*' in ~/Library/Preferences/ByHost/. This will clear your iTunes preferences.

Next, open Terminal.app and run each line one at a time:

defaults write com.apple.iTunes file-buffer-size 512000

defaults write com.apple.iTunes stream-buffer-size 512000

You may need to experiment with the number, but 512000 works well for me.

Disclaimer: iTunes may or may not decide to use these preferences, so it's entirely possible that it fails to read these values and they don't have any effect. With that said, I do seem to notice far fewer skips and stutters with the 'buffering stream' window popping up after having set this.

Great!

But 512000 doesn't work fine for me, 256000 was like a charm 😉

Using iMac 27 16Gb...

I'm on iTunes 12, and changing the buffer size didn't work for me. I tried 512000 and 256000, and neither helped. It's really frustrating that all of a sudden I simply can't listen to internet radio at all (unless you count 3 seconds worth as listening). A few days ago, everything was fine. My internet's working fine otherwise, and speed test comes out the same (around 70Mbps download). Any new ideas?

So far, I would suggest using the sources stream and importing it to iTunes specifically.

A majority of stations rely on hosting that they pay for, or are sponsored (even at small levels).

Have you tried this with multiple stations/genres?

On iTunes 12 try using 256 instead 256000 and so on

Using terminal commands (shown above) and using the 256, or 512, dropping the zeros in the earlier suggestion worked perfectly for me! iTunes 12.5.5