When parsing with a MagSorc and MapPlar, some skill executions are still spasmodic, stuttering, and delayed. The issue can easily be reproduced by just using Daedric Prey then follow up with light attack immediately after the GCD of 1 second. On the Sorc, the issue seems isolated to any skill following Daedric Prey, but it's enough to throw an entire rotation off.
The issue with MagPlar, feels the same while not always specifically repeatable. Sometimes skills are delayed, while at other times it feels like a skill (Sweeps) is dragged out a fraction of a second too long, sometimes not firing at all. And the issue feels like it's spread out over all the skills.
I've parsed these 2 builds a thousand times. Something is just off...and it's not lag (at least not measured by my ping which runs from 60-70ms throughout). In both cases with began with patch 6.2.3 and continues with 6.2.4. This happens on different computers at different times of the day. Parsing on either of these toons is just bad. Bug reports have been filed in-game.
As a side note, I have no issue whatsoever parsing Stam toons.