[BestPractices Removing micro-optimization note about @Template

| Q   | A
| --- | ---
| Doc fix? | no
| New docs? | no
| Applies to | 2.3+
| Fixed tickets | -

Hi guys!

I think that a small performance gain is not a *great* reason to recommend something. And really, this was not the most important reason for recommending against `@Template`. I think it's clearer to focus on the real reason, and not get into performance (we could argue against using any feature because of performance).

Thanks!
Is the perf impact related to the usage of the listener, or to the magic used inside this listener ?