Region3 creates a lag spike

Basically, what the titles say. Whenever I cast a region3 of a facility, it creates a small lag spike. This is probably due to the large number of parts it contains, which is over 20 thousand.
Can anyone help me with either an alternative or a fix?
https://gyazo.com/05afdbf493427a45386581696cbab344

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Tell us more about why you’re doing that region3 cast