p.s. this is posted in wrong section (I'm seeing your question posted on completed addons section)
Anyway, in addition to what Xenox said, in case you're hesitant about sharing your capx, you can use the debugger to find out bottlenecks in your code. Often too many draw calls or running events every tick can really kill the performance. Analyse the code you have written and think how a machine would operate, and how things could be further optimized. Without seeing the capx, my assumption is that probably it could be some performance-related problem but there can be many other roots too. it may sound basic, but have you checked what event sheet those layouts are linking to? perhaps you should include some other layouts holding the controls etc.