Frost Mage Questions

Hello! I extensively watched a video guide on the Spellslinger (Ray of Frost variant) ST rotation for Frost Mage, and despite feeling like I was performing the rotation near-perfectly (with the occasional accidental Glacial Spike without a Flurry ready), I was only able to maintain a DPS of around 850K after dealing 600M damage on the training dummy in Dornogal. In the video, the guy was dealing about 1.3M sustained.

To be fair, my IL is only 617 and I don’t have Spymaster’s. My Crit is 30%, Haste is 26%, Mastery 15%, and Vers 6%. I didn’t have flask on. Can this gear/stat differential account for this much of a gap (450k)? I’m a returning player and just want to know if I’m playing the class horribly wrong, or if it’s mostly just that I need to be better geared and optimized. Thanks a ton!

The guy you’re comparing yourself to is
1: Ilvl 636
And
2: a master mage player
Seeing as you’re learning the rotation, I’d guess your rotation wasn’t as perfect as maybe you thought (meant to be a constructive criticism).
Raise your Ilvl, keep watching videos and guides and keep practicing!
Aside from that, it’s hard to help otherwise without seeing you actually play.