Why do i keep getting FPS drops?

Update: Fps drops for no reason TY Hey, I just received an Imac for my 21st birthday and am trying to play fortnite. I can sit at around 120FPS with fine settings, however after about 30-40 mins of gaming my FPS will drop to around 30 until i restart. 3.8GHz quad-core 7th-generation Intel Core i5 processor Turbo Boost... show more Fps drops for no reason TY
Hey,

I just received an Imac for my 21st birthday and am trying to play fortnite. I can sit at around 120FPS with fine settings, however after about 30-40 mins of gaming my FPS will drop to around 30 until i restart.

3.8GHz quad-core 7th-generation Intel Core i5 processor Turbo Boost up to 4.2GHz 8GB 2400MHz memory, configurable up to 64GB 2TB Fusion Drive1 Radeon Pro 580 with 8GB video memory Two Thunderbolt 3 ports Retina 5K 5120-by-2880 P3 display
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