as the title says, FPS is ok outside of the trial area (> 50 FPS), even inside, as long as the fighting has not started or still using simple graphic effects (> 30 FPS), but the moment the AOE and what not (can't even say what else was going on, the experience was THAT choppy) the FPS goes down to < 1 FPS.
Fighting this thing in effect blind-folded, anticipating what to do next, i.e. in the next 5 seconds, the ping rate at some points was >> 10.000 !!).
Even massive PVP (with 3 blue zeros colliding with 2 reds on AD in the middle) is not that bad.
This was with graphic settings already reduced to medium textures, medium subsampling, and everything else (shadows, water, blur, distortion, ...) switched off.
Thanks to the others and more luck on this one's part to guess right what to do and when to block, or group still finished the damned thing (normal mode)
Will not return there, EVER. (yes the whole experience really was that bad)