Why are signals considered more performant than RxJS?

Signals are faster because they work in a targeted, synchronous way, without unnecessary subscriptions and without passing data through a stream.

#Main reasons:

1. No subscriptions. A signal is simply a value in memory. On change, Angular knows who to update, without the subscribe() and unsubscribe() mechanism.
2. Synchronous work. When you call set(), the update happens immediately. RxJS often processes events asynchronously, through a task queue.
3. Precise template updates. Angular with signals updates only the elements where the signal is actually used, not the whole component.
4. Less overhead. RxJS has a complex mechanism of streams, operators, and subscriptions. Signals have a simple model of storage and reaction.

Summary: Signals are "direct reactivity without intermediaries". They do less unnecessary work, so they run faster.