Ah, OK.
So, at the end of this topic I understood my system is still good for my daily use. Thanks who answer my questions and share opinions.
Best.
Normally, if the symptom you're trying to get rid of is stuttering, the next question you ask is "why".
A web browser can stutter because of several reasons:
1. CPU bottleneck - easily spotted if task manager pegs your CPU usage at 100% for long periods of time (not a problem if that kind of load is only brief; harder to spot if your browser isn't using all cores: some of your cores may be pegged at 100%, but that requires looking a little closer
2. Not enough RAM - again, task manager will tell you where you stand
3. Frequent disk access - resource monitor in Win10 will tell you if an app is doing heavy disk access
4. Network - open up the developer console in your browser and see whether stuff takes long to load
Then again, facebook itself is kind of a resource hog, I strongly recommend you give it the AdBlock+NoScript treatment (you'll have to tell NoScript to allow some scripts, just make you you don't allow them all).
Fwiw, I'm browsing right now on two monitors (one of them is playing a flash game) on an i5-6600k (which is not much more powerful than what you have - in fact I have 4 logical cores less than you do) and my experience couldn't be smoother.