OK then. Since I'm not there to see everything going on, I'll offer a suggestion/opinion although I am not a expert on testing methodology.
GTA-V shouldn't take that much ram to run, especially if you're only playing on a 1080p monitor. Even if its 120Hz with Chrome open. Chrome browser (one tab) wont usually take over a fourth of a gig. So I'm thinking its not a Ram issue since you already have 16GB.
Buthave you looked in the Task Manager to see how much Ram is being used with both open?
You might have something else running also that's taking up resources and maybe not Ram, but CPU?
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