Date & Time: Anytime I play the game
Frequency: All the time (I can counter-act this by limited fps to 60 or 30, naturally reducing load accordingly, to about 70% and 35% respectively)
World Name: Ragnarok
Character Name: Vanny Schmeler
Party or Solo: Both
In-Game Time: Abytime
Area and Coordinates: Most noticable in Kugane but pretty much anywhere
Steps:
1. Login
2. Try to play
3. Profit

GPU performance change before and after you started having the issue: Unsure how it was before, I recently returned to FFXIV so I don't have a baseline.

GPU: Radeon 390x
Driver Version: 18.9.1
CPU: i7 4790
RAM: 32Gb Kingston X
Hard Drive: 128Gb M.2 SSD, 256Gb SSD, 1Tb External USB HDD, 2Tb SATA HDD, 4Tb USB External HDD
OS: Windows 10 (latest update)
OS Version: Windows 10
Graphics Settings: Borderless Windowed, 1440p, High Laptop settings
FPS Limit: (System Configuration > Display Settings > FPS Limit) When off issue is more prevelant, setting it to 60 normally to limit this issue.