Performance - Refactor from `Node.appendChild` to `Element.append`

[bebraw]

Apparently "Element.append" can be much faster than "Node.appendChild" because of...... MutationObserver! 🤦‍♂️ I just stumbled on this: 1 "append" for N nodes causes the observer to give you 1 mutation record, N "appendChild" for N nodes cause N mutation records

https://twitter.com/fabiospampinato/status/1559925222182195201