I have modified Feathers TinyGL example, i have added three defines at top of feathers.c. TEST_1 compiles one version that uses glIdleFunc, at full cpu use, on my MacMini system it show small jumps. TEST_2 compiles with glTimerFunc, it doesn't work smooth. Last test is TEST_3, it's the same that TEST_1 but a WaitTOF call was added at the end of display function, it doesn't work smooth on my system. Here is the pack:

Feathers TinyGL example