FPS Lag on Certain Maps

So this is probably a stupid question but I'm gonna ask it anyway since I am by no means a computer whiz. Why do I get FPS lag on some maps while on other maps my FPS is fine? For example, I normally play the Lab map for GM instead of Lost Relics because when I play Lost Relics my FPS drops to below 10 while in Lab its normally 25-30. Thanks for any help you can give!
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