People have been asking for a fix to this for over a decade. It is most noticeable with ogcd weaving and player position updating. CBU3 has never shown that they even care in the slightest that this issue exists and they likely never will.
Here is a link to a thread that has complied some very detailed threads about the the issue. https://forum.square-enix.com/ffxiv/...tcode-of-FFXIV
Some of the links in that thread are a decade old.