How can I fix this FPS drop following the 15/3/2017 CS:GO patch?

I've been running Counter Strike: Global Offensive on my laptop (NVIDIA GeForce 840M 2GB and an Intel processor) at 150fps, however after the 15/3/2017 update I'm suddenly experiencing only 30fps. Worse, whenever I see an enemy and shoot it drops to 15fps.

I haven't made any changes to my PC prior to the CS:GO update on 15/3/17 which is why I think it's the culprit. I've tried reinstalling everything: Steam, CS:GO, Nvidia drivers and changed a lot of settings. I also made sure to pick the Nvidia card for the game.

Sometimes my FPS goes back to 150 but whenever I open a menu it drops back to 30 or it goes back down to 30 in a couple of minutes. Is there any way to fix this? It's making MM unplayable!

Solution 1:

I've been having this issue aswell, this only happend on both my laptops, not at all on my PC. My temporary fix is: Keep the game running offline versus bots for about half an hour. My FPS went up to about 100 meraculasly. Just make sure you don't close your game in the meantime. This is how I play for the time being, untill this issue is fixed by Valve.