Consistent latency spikes bug/annoyance

Hi. I've been monitoring the FPS and Ping on my marauder while playing and here's what i found:

1. My average ping is around 40-60ms most of the time.
2. Average FPS is around 40 with enough times going towards 50-55.
3. Lag spikes occur (apparently randomly) sending the ping to 300-400 (i never saw more).
4. Whenever a lag spike occurs, the FPS either drop towards 20 OR go up towards 70-80 !
5. It's not consistent, but using single target abilities and opening "Tribal chests" seems to increase the chance for a lag spike.
6. There is no indication of them happening, EXCEPT for what i'm describing below.

PS: this is not related to my computer/internet provider/etc. If it was, i should've seen a (significant) change for the worse when uploading stuff with 4-5 MBytes/second in the background or downloading with 8-9 Megabytes or both... But there is no change - the lag spikes happen roughly just as often with the same values from point 3. I should also mention that this is the first online game where i'm having this problem (after playing Diablo3, wow, SWTOR, Dota, etc) so i really doubt it has anything to do with my stuff.

Please fix this; it's extremely annoying to waste mana on abilities when the mob has already moved but it's not shown. The most stupid encounters are against archers, that run away all the time (and those monkeys too). Whenever i want to follow one, it moves away slowly, and after 2 seconds it suddenly accelerates and the distance triples!! (even though my character should've followed him since it appears as MOVING).

There is also a second problem related to these lag spikes: they make you MISS a hell of a lot more than usual! With an 80% chance to hit with a staff, it's kind of strange to see 4-5 attacks miss in a row!! And no, it's not an isolated case. If i happen to be attacking right before or during a lag spike there is a very good chance it'll occur. This makes the "Sweep" ability really frustrating as i'm casting it over and over until 0 mana, and there are still some normal mobs alive around me... 80% hit chance my a**...

It's either this or a huge discrepancy between the animations we see and the hits/moves/etc registering on the server.

bump

Same Problem here. FPS drops from 63~ to 5~10 and latency too... It happens all the time. I play this game since closed beta and i had no problems, but now :o

Also have this problem, I can't even fathom beginning to play hardcore with this issue as I will often die from archers/ elemental skeletons for what seems to be no apparent reason.