Low fps on multiplayer

When i play on multiplayer, my fps gow extremly f-ing low.
I could expect the fps droping quite a lot because i’m running 2 games on one pc. However, it drops beyond i could imagine, don’t know if its a bug or not.
On the light map that i use for testing, i get at least 65-70 fps with shadows, and 40-60 fps with shadows,
but when i play on multiplayer it drops to 10 fps with only 2 players. Removing the lighting seems to do nothing to boost fps.
I use a acer aspire f15 with i7 7500U , 8gb ddr4 2100 and something ddr4 memory and geforce 940mx gpu.
Is it supposed to drop so much fps with those specs?