I've already been in correspondence with Turbine Support concerning this issue but I wanted to post it here to give others the opportunity to chime in as well.
The Ice Storm Spell causes considerable lag on my system dropping the average FPS from the mid 60's down into the low teens or even single digits. I've tried numerous graphics and audio settings as instructed by Turbine but nothing seems to help. The lag is so severe that I cringe whenever I find out there is a water savant in the party and would desperately like to see a fix very soon.
My System:
ATI Radeon 3650HD 512MB Graphics Card
4GB of DDR2 RAM
Windows 7 64-Bit Premium
When I detect optimal graphics settings, the client defaults to Very High. I've tried everything from Very High to Very Low settings and the Ice Storm still bogs down the system to a miserable 10 - 12 FPS. If multiple Storms are casts, my graphics drop to 6 - 9 FPS. These are the speeds I get while standing in the middle of the Storm which is where my Melees always find themselves. If I stand outside of the Ice Storm, my FPS increases to the 15 - 30 FPS range depending on the distance. I've tested this in multiple settings including the Vale of Twilight, the Subterranean, Kobolds New Ringleader and Bringing the Light. The results are always the same.
I've even tried using Game Booster 2.3 to help correct the issue but there was absolutely no improvement.
If you have suffered similar lags with the spell, please post to this thread and let Turbine know about it. I've been told that their QA Team and the Developers will be looking into this, but if I can show that it isn't an isolated incident, a fix may come sooner rather than later.
If you would like to check your own FPS, you can use Ctrl+F and look for the readout on the right side of your screen.
Thank you for taking the time to read this and any additional information you may have to offer to help resolve this issue.