I got some time to test out cutting with different speeds and feeds. I used a piece of 1" thick pine (0.755") to cut out circles and rectangles, 1 each at each setting. Used Whiteside RD2100 0.25" endmill.
Tested:
12000 RPM, 60 in/min, 20 in/min plunge, 0.125 and 0.25 pass depth (4 cuts)
17000 RPM, 85 in/min, 25 in/min plunge, 0.125 and 0.25 pass depth (4 cuts)
22000 RPM, 100 in/min, 30 in/min plunge, 0.125 and 0.25 pass depth (4 cuts)
The quietest and cleanest cut was at 12000 RPM, 60 in/min, 20 in/min plunge, 0.125 pass depth (from the article basic spreadsheet - .0025 chipload). At 85 in/min the bit was noisy (slight squel). 100 in/min scared me but was about the same noise as at 85. It felt like things could go out of control fast at 100 in/min.
All in all I am very happy with the results of the 12000 RPM, 60 in/min, 20 in/min plunge, 0.125 pass depth. Very quiet and nice clean cut. I am not sure if I will revisit this later and be a little more adventurous.
Hope this helps.