If you are using wifi, then see if the slowness continues when online hooked by cable to the router. You must first determine if it's truly the laptop, or if it's the online connection.
I have a Samsung laptop (NP350E5C), Dual core Intel, Pentium 2.4GHz, 4GB RAM. I am running 64x bit Windows 10 Pro Version 1607.
I am an online teacher, so I always have two or three apps that are open at the same time (Skype, QQ, ABC360 platform - the last two are programs similar to Skype but come from China), but of course, I only use one at a time. In addition to them, I always have four tabs open in Google Chrome (google images, online dictionary, pdf of the lesson, and the website with my schedule). In the last couple of weeks I have been experiencing serious problems in the sense that my laptop is becoming increasingly sluggish as time passes by. The Task Manger was always showing over 70% RAM usage, so I installed an extension called the Great Suspender. It did decrease the RAM usage to around 50% but the sluggish performance remains the same. I've searched the internet for the solution, tried all sorts of suggestions (registry hacks, more frequent defragging) and nothing seem to work. The only reason I ask is because I have come across some people who told me that they have 16 GB of RAM and experience the same problems. Is there any hope of turning this around? What kind of setup would you recommend considering what I need?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic