Don't use ngIf or ngFor.

Angular 17 introduces new control flow syntax. Here’s a summary of the benefits of using this syntax:

• More ergonomic syntax that is closer to JavaScript, thus more intuitive requiring fewer documentation lookups

• Better type checking thanks to more optimal type narrowing

• It’s a concept that primarily exists at build-time, which reduces the runtime footprint (making it “disappearing”) which could drop your bundle size by up to 30 kilobytes and further improve your Core Web Vital scores

• It is automatically available in your templates without additional imports

• Significant performance improvements

Old

<div *ngIf="loggedIn; else anonymousUser">
  The user is logged in
</div>
<ng-template #anonymousUser>
  The user is not logged in
</ng-template>

New

@if (loggedIn) {
  The user is logged in
} @else {
  The user is not logged in
}