Upgraded net speed hoping for improvement....

[Edenn]

Ive been having a very similar issue.
My family upgraded from 200 to 300 mbps, but my ping suffered, 110s-120s as an average, when i was initially at 80-85.
Either some server stopped working as soon as we got the new modem, or the modem just reaaally hates ffxiv.
hope ur issues gets resolved soon! <3

[Arzalis]

So, a few things here:

Bandwidth (usually referred to as download speed) has nothing to do with latency. To use the water and pipe analogy, bandwidth/download speed is the width of the pipe. Latency/ping is how long the pipe is. It will help if you're trying to download very large files (think about moving a bunch of water through a pipe, a wider pipe helps then), but MMOs in general are pretty efficient with data transfer so download speed is unlikely to ever affect gameplay unless it's extremely low.

With that said, if tracert is showing nothing usual at the same time you're having issues in game (specifically no issues at the NTT servers -- the usual culprit), then the issue could be something local with your computer/network. I know this isn't what you want to hear, but it could be something silly. Maybe firewall settings or something so it's worth checking those out.

As a random thought, is your router actually handling the new internet speeds well? Some routers can be overwhelmed even if they technically support 1Gbps connections due to buffer issues. If your router has a QoS/SQM option, it might be worth trying since that should prioritize FFXIV's traffic on your local network. This would normally show up on a trace route/ping test as dropped packets, but it's worth looking at even if it doesn't.