

Since the Renoise GUI is basically drawn by CPU (I proofed this by doing some tests, although I found CoreGraphics and Quartz? references in the code), the lower the CPU speed, the less fast the GUI will be. It is said to be not capable of running the cpu at maximum speed for more than 1 minute, then the thermal control in the device will already downclock the cpu quite drastically. The current and last macbook (pro) generation has some real design flaws (too thin and poor thermal ventilation). Spotlight was not indexing in the background, so more cpu was available, or similar. I think you experienced a “random” kind of change, e.g. Never tried running Renoise on it, though. When I opened up the laptop clean without all my ported data Alchemy ran fine.
