Searching the internet and playing online games is an internet speed issue. Even a weak dual core e8400 from 8+yrs ago can do that speedily with a faster internet connection. What is your ram usage like, is it around 4-5gb out of 8gb being used or are you closer to using 7.5gb+? You mentioned a 1tb hard drive, is it a 5400rpm (like a wd green) or is a 7200rpm (like wd blue)? How full is the drive?
Some would suggest an ssd and I'm sure it would be an improvement for things like opening/closing programs however if a standard hdd is performing correctly, isn't heavily fragmented or full to the gills, it should be quite snappy. I'm running this machine on a single hdd and opening/closing programs takes fractions of a second. Though I've also used pc's with full hard drives, running low on ram, slow rpm hard drives, cluttered hard drives etc and the simplest of things will feel like working with molasses.
When you say csgo is running just as slow as before, I'm assuming you're playing it online. If that's the case and it's running slow, your web searches are running slow it all points to a slow internet connection. A 5960x $1000 8 core 16 thread cpu won't help that. What type of internet is it, dsl, cable? If cable, it usually runs off a shared connection throughout the neighborhood. Some are worse than others, but in some cases say in the late afternoon or early evening when people get home from work and everyone jumps online it can (not always) heavily impact the shared speed. In really bad cases people with 'fast' cable internet experience 56k speeds just because the local network is that heavily loaded. Which is why isp's often say 'speeds UP to x amount' in their advertising, not a guaranteed speed.