"Zones" within a section

I am experiencing issues with some sections on a project I am working on, all of the sections in this model have these "zones" within the section plane that I believe are causing the big graphical and performance issues that I am experiencing. The model lags my machine quite extremely when clicking on these sections and in the sections taken, the 3d model jumps and moves about when zooming in and out. Below is a screenshot of my issue.

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