Major Performance issues (certain areas only) PC/Win10

[Reiryuu]

Hello.

I am returning to FFXIV after an absence since around 5.0. I play on a Japanese server, Kujata, however I live in Taiwan so keep that in mind when we talk about the issues I'm having.


First, the issue: Very latency-esque issues in certain duties only (see below) getting hit by mechanics I seem to be clearly not in the hit box of, animations freezing my character's movement so that I slide around and not run, spell animations not going off, etc. (The latter issues being far more frequent than the former.)

This type of stuff happens only in:

The Neir 24 man raid: Rarely in the copied factory and puppet bunker, but much more often in the latest version.

The Bozjan critical events, the 24-man raid in Bozja, and the Castle event in Bozja. Content which I am unlikely to repeat now that I am rank 10 and can get my epic to i515 or so which will do until I get to Endwalker.

Stuff I have tried and noticed.
1) For some reason lately I have been getting poor connections to Kujata though I never had when I played before. I have, however, gotten excellent connections with Kujata through the use of a VPN and the issues remain.

2) My video drivers seem up to date.

3) I have tried closing YouTube, etc. And shutting off other programs that might be eating at my bandwith.

4) I have tried restarting my router.

Now, my computer IS an older one and I do hope to upgrade it when I can actually get my hands on a new video card. If this is perceived to be a PC specific problem that my comp is aging and unable to perform on this content, what kinds of things might alleviate this problem when I get a newer PC so I don't run into it?

EDIT: Just to clarify, I have done Crystal Tower, Mhach and Ivalice raids since returning and these issues have not been occuring there.