I've installed ad blocking plug-ins after I suggested the blocker 2 days ago. OB loads much quicker and I haven't had the slowness which I used to experience almost every day. Indeed, amazing amount of speed up. For Chrome and Firefox, uBlock Origin seems to be best. For Safari, I'm using Ad Blocker Plus. From the reviews, Adblock Plus may remove more ads, but it requires more computational resources. Here are the links:
uBlock Origin for chrome
uBlock Oriding for firefox
Adblock Plus
So I'm pretty sure this is the cause for my case.
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