Guild Wars 2

So recently, I’ve built a gaming PC for 1,300$. I was thinking of going back into Guild Wars 2 because I used to play Guild Wars 2 on the lowest settings on my laptop, at an unstable 30 FPS (what I mean by unstable is that it keeps on getting FPS drops, down to 10-15 FPS then back up again.) Now that I have a better PC, I can play Guild Wars 2, but I have to buy Heart of Thorns first. Should I go back to Guild Wars 2 even though I have missed out a lot, and buy Heart of Thorns, if it is worth the money? I’m a level 80 Thief with some pretty good stuff (and yes, I’ve played for quite a while on lowest settings. I feel bad for myself.)

So, there’s a reason why I haven’t played Guild Wars 2 in a long, long time, and that’s because of massive and random FPS drops. I tried many things so far, such as lowering the video settings, set my battery options to high performance, etc. Is there any other way to fix this?

Specs:
Inspiron 5447
Intel® Core™ i5-4210U CPU @ 1.70GHz
8.00 GB of RAM
64-bit operating system, x64-based processor
Intel® HD Graphics 4400

This happens almost every time I go to a certain map in Guild Wars 2, not all the time. When I’m playing GW2, a sudden freeze hits me, causing everything to slow down. I’m unable to dodge, move and attack correctly, and that makes the game almost unplayable. Once or twice is alright, but now it’s absolutely unacceptable. Is there any way to counter this?

The last time I was here was December 2013. I feel like my bad habits were getting the better of me, so I stopped playing. However, I keep on getting new email that there’s new events going on in Guild Wars 2, and it seems to haunt me.

I’ve been experiencing GW2 as a level 80 thief, and I seem to like the game so much. That makes me want to come back to this game. However I’ve been missing a lot of events, and my guild is angry at me for being away for so long, and thus it makes me nervous, seeming like it’s already too late. It’s a very tough decision to return to Guild Wars 2, so what do you guys recommend; should I return to GW2?