Blade and Soul game freezes during big fights

Blade and Soul is an incredibly CPU-hungry game. More specifically, it's an incredibly single-core-performance heavy game. From personal testing, I've found that this game's overall performance is tied to two things: CPU clock speed, and RAM speed. Since it's built on an older engine and unable to take advantage of newer, more efficient instruction sets, all you can really do to improve performance is to make those two things run faster. Oh, and having an SSD actually makes a huge difference in this game, for stutter and load times. And having 16GB of RAM. I tried running this game on 8GB, and within 3 hours, had completely run out of RAM, multiple times. Now that I have 16GB of RAM, this game will very easily eat up to 12GB by itself no problem, sometimes going up to 14GB.

My PC build is in my sig, and it runs this game really well, pinned at 80 fps (I limit it to 80 because the in game fps limiter actually kills a lot of fps and there's no way to turn it off, set it to either 60 or 80), and if I don't ctrl f, on completely maxed out settings, I get like 40-45 fps in DKV and 30-40 fps in MSP.

That said, there may be something else is at hand. To start, download Realtemp, leave it open during game, and report back with your CPU temperature maximums. Defrag your hard drive (optimize drives through windows), run Windows' Memory Diagnostic Tool, remember to enable the FPS and ping displays in game, and keep them somewhere easily visible, shift + f1 to rearrange the UI. Keep task manager open while gaming to see how much RAM and CPU gets used. If you ever go over 7GB~ish used, you're running out of RAM. From the video you linked, it really, really looks like what happened when I ran out of RAM playing this game, where it slowly grinds to a halt as it stops writing data to RAM (which is super fast), and starts doing all of its work directly onto your hard drive, which is snail slow.

Another thing to do in game is to disable the context display for joint attacks. In the options > Game > Camera > Mouseover Options, uncheck "Display Contextual Action Prompts". Should give you back a whack ton of FPS when someone else around you is attempting to CC something.

TL;DR There's no reason an i5 6600k + GTX1050 combo can't run BnS. Get that second RAM stick, then get yourself an SSD. Or both at the same time.