still to slow?

If you applied the above 4 tips and OPENCP is still running too slow, there's hardly anything left to tune. Remember that graphic modes are generally slower than text modes. And in text mode the analyzer uses most ressources. If you only display channels, instruments and track list there's almost no cpu consumption by visuals.

If the player is still too slow your last chance is to lower the mixing / playing rate of the player. Locate the following line in the [sound] section of cp.ini:
mixrate=44100
Use the table 4.3 as a guideline to set this value.

Figure 4.3: command mixing rates

While applying those patches please remember that modules with more channels will always need more cpu power than those with few. If your Impulse Tracker modules (.it) always click and pop while old Amiga modules (.mod) play fine that's normal, because the modern trackers allow more than 4 channels.