Hey Burnrate-
Attempting to do loop through anything 60,000 times each frame is going to cause performance issues. On top of this, draw calls and debug messages are already expensive processes and making this many calls is going to have an impact on performance. You can instead try writing a message to the logs rather than using a debug message on screen. I would also suggest only making this call when necessary rather than on tick as well as making your loop size smaller if possible to reduce how much information is being processed at once which will help performance.
Cheers