So I have pretty good Internet, 30mb/s download, 3mb/s upload. And nothing's wrong with it, until I start playing Grand Fantasia. I get random disconnects(my entire Internet, not just GF) and it lags really badly, spikes up to 10k ms or more. Does anyone know what can cause this?
If you're using ignite/akami, those are known bandwith stealers. Grand Fantasia does have a memory leak issue and will have to be closed and restarted often (around every 2 hours is safe). Try reinstalling Grand Fantasia using a GF Mirror
to keep from using Akami and Ignite.
Further, make sure you're not using Skype, Pando Media Booster, and the like, as they too suck bandwith.
If your whole laptop lags while playing GF, check your drivers, hard drive health, that windows is updated....etc. Make sure you're running GF in admin mode and have GF allowed through your firewall and AV settings (as this sometimes can trigger lag if certain packets aren't being allowed through).