Yea sorry I have no Idea why this happens... maybe becaus I had to fully recreate the menu to add my additions to it.
Also, now that I think about it, it shouldn't be the modified menu that causes the interface lag. When you set Incest Mode to Disabled, the modified menu is still present, but the lag disappears. It must be the other features causing the lag.
If you have copies of the previous versions of the mod, you can test to see if there's an earlier version that doesn't cause lag, and which change added it.