My problem running fortnite

[kosonenmatias]

When I play fortnite on my PC first my FPS is around 80 then when the game progresses my fps keeps dropping by a little and when it's time for final gunfights I'm rocking 20 fps. What should I do

Specs:
Asus x550v laptop
Nvidia GTX 950m
8 gigs of RAM
118 ssd
1 Tera hard drive
Intel core i5-6300HQ 2.30 GHz
Activated 64-bit windows 10

 

[sizzling]

What are your cpu & gpu temperatures when your FPS drop to 20?

 

[ThatPcBuildingKid]

What are your temps?

And fortnite is in beta for some it works for others it doesn't, i get fps drops too with a 1080.

Is your power plan set to balanced or High performance?