Question Fps drop in fortnite

Mar 31, 2019
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When playing forcibly most of the time from 45 fps it reaches 15 fps.
Specify laptop:
processor: AMD Radeon A8-7410 with radeon r5 graphics 2.2ghz turbo boost 2.5GHz
video card: AMD Radeon r5 m430 2GB
Ram: 8Gb ddr3 1600mhz
Storage: HDD 500GB
Operating System: Windows 10 Home 64 bit
No overclock