Hey there,
I went ahead and moved you to your own thread since your issue is unrelated to that other thread you posted in.
If your home/world latency is low but you are seeing ability/looting delays that take multiple seconds, that sounds more like the issues reported in this thread. You will usually find that the ability/looting delays only affect a specific zone, and changing zones or toggling War Mode on/off will make the issue go away. If it’s affecting ALL zones for you then that would be something different.
The release of WoW Classic would be unrelated to these issues as well, as we haven’t seen any spike in reports since Classic released. It is something that is on the radar of our WoW team however.
Next time this happens for you see if switching War Mode on helps.