PHPStorm + Laravel Idea + the laravel-ide-helper package provides such a great PHP/Laravel development experience that I haven't been able to replicate in VS Code or Sublime. But chowing as much RAM as it does, it feels sluggish. Or at least, not as snappy as the alternatives. But I just haven't been able to find a middle ground with the lighter alternatives.
Running the IDE as a thin client with Jetbrains Gateway sounds like a decent solution, if your backend server is close enough for latency to feel okay. From a ~4GB PHPStorm usage, PHPStorm-via-Gateway on GitPod was 1.2GB max.