This may be a long term thing but I only just noticed with the latest release (v1.1.08) under High Sierra: When launching from within Ted2, if you Print enough during execution your program will end up running in fits and starts. The less you log per frame the longer it takes, but it always seems to kick once you’ve logged a certain amount. (I habitually have every major method log that it was called at least, so even low-complexity stuff stutters after a short amount of time). Running the built product on its own results in normal behaviour, it’s just when you run from Ted2 and continually Print stuff — the CPU usage of Ted2 in Activity Monitor eventually goes over(!) 100% and it becomes unresponsive.