How Do You Find The Reason For FPS Drops?

[Graveboot]

First off here is my build.
MSI 970a G43 Mobo
AMDFX 8350
Nvidia Geforce 970 GTX
8GB DDR3 RAM
Windows 7 Professional

Sometimes when I'm playing games either my fps drops really low or I'll experience hiccups. I'm playing games like league of legends, heroes of the storm, PUBG. I never put my graphics setting on high. I usually keep them around the medium settings. How do I pinpoint the issue? My first thought would be that I need more RAM.

Any help would be nice!

 

[Carnaxus]

MSE should be replaced with a good AV, whether paid or free.

I use Kaspersky; I've had zero issues with it lagging my games. It just insists that every single program I run is suspect again every time anything updates, be it the game or Kaspersky itself...:lol:

Edit: Apparently someone just now stumbled upon this post and downvoted it. This post is very old; I no longer use Kaspersky. In fact, I actually don't have an AV program at the moment, just Malwarebytes Premium. I stay safe through safe browsing practices, including not browsing questionable sites.