Command Blocks Lag When They Shouldn't

YouTube link describing and demonstrating issue: https://www.youtube.com/watch?v=xGUHaRAT498&feature=youtu.be

I can't give a public world download, as this is a large-scale map I am working on that will some day be released to the public. If any mod or dev so wants, I can send them a private download link for just the computer.

This bug (Or a slight variant of it) has been reported before, but it was said to be fixed for 1.8 worlds. The world in question is a 1.8 world, but the bug also occurred on two 1.7 worlds.

In the video I demonstrated the xp-jumping interaction, but it can also be demonstrated with the use of certain items that my commands are affecting, certain enemies and teleport commands issued by the setup, among other things. Also to be noted is that when the command blocks are lagging, things like fall damage also lag (It still occurs, it's just really delayed).

Ask questions, I'll be more than happy to respond. I just need this fixed, as no one can play this map if it isn't fixed.

Attached screenshot is the pie chart without me recording.