As stated in my original post, this problem only occurs when playing the game on hardware, or on my phone. Playing the game within a browser on my computer is not a problem.
If I am playing the game (on hardware or on my phone) without seeing the code, surely that should not need to spend time recalculating the block code. (If you are using the blocks workspace and scrolling it around (panning), your computer needs to spend extra time re-rendering all of the blocks.)