Extreme spell lag?

[Faerie Blossom]

I've had spell lag most of the time I've played here, but tonight it's become really unbearable. I'll begin to cast a spell, and sometimes the spell won't cast for over 60 seconds. This makes playing a caster difficult :/

I still seem to be able to melee without lag (so long as I'm not stuck in casting mode), but I won't be able to do things like open doors or click the Gfay lifts. Strange :S

Any ideas?