Before I get into details, I do need to note a few things.

Ever since late last year, every major patch caused PSO2 to have ungodly loading times when switching blocks/areas (Often taking ~5 minutes) when it shouldn't have.
However, with the March 5 patch, nothing I've tried is countering this any longer.

Things that I have done already:

Use practically every troubleshooting option in the Tweaker
Check/Update files through the official launcher
Clear out the Gameguard folder
Run PSO2 alone
Exclude usage of any patches

Unfortunately, due to my really bad internet speed (1Mbps, and lack of access to a better one) Reinstalling PSO2 is simply not an option.

To put it in short: I cannot seem to fix PSO2 any longer, and I have ran out of options (As well as mental stability), so I've only the option to ask the community for assistance on this matter.

On secondary note, I am using a laptop W/Windows 8.1 (Bit tired so no accurate specs, but it is recent) so I can run the game just fine.

If there are any further details I can provide (Or if I've done anything plain wrong" do notify me.