at first, when i opened my csgo, or any other games it has 120fps+, except PUBG i only got 30-40 fps but it runs smoothly. Now, i got like 120 fps on the csgo menu and when i played casual / deathmatch / competitive it drops till 50 fps tops. the fps wander from 8-55 but it mostly stays at 28-34. i need help pleaaaaaase. :(:(
its unplayable.

my laptop is ROG gl552jx
Windows 10
8gb Ram
1tb HDD
250 ssd m.2 sandisk
GTX 950m
Intel(R) Core(TM) i7-4720HQ CPU @2.60Ghz ( 8 cpus)