[mtndew]

the spec of my mage is both arcane and frost  yes it happen*(ed)* on both.
I was getting so frustrated that I was doing a lot of research and came across FPS issues in the old forums.  This post right here sounded so familiar to my situation.

https://www.dugiguides.com/oldforum/showthread.php?8736-FPS-steadily-dropping-from-100-to-20-while-using-dugiguides&p=35948&viewfull=1#post35948

I had castsequence macros in my character personal list:

#showtooltip

/cleartarget [dead]

/targetenemy [noharm]

/castsequence reset=target Slow, Arcane Blast, Arcane Blast, Arcane Blast. Arcane Blast, Arcane Barrage, Arcane Missiles

plus one for frost

Removed these macros and I am doing ok hitting at the most 41mb usage in previous tested areas