Best load model performance

Hello all,

I'd like to know wich of this options give me the best performance when loading models to find data.

1. The use of "use" propertie on controller
• public $uses = array('Model1', 'Model2', ...);
  
2. The use of loadModel method inside specific method
• $this->loadModel('Model1'); $this->loadModel('Model2');
  
3. The chain model 
• $this->Model1->Model2->find
  
• $this->Model1->Model2->Model3
  

I did some tests using DebugKit to compare memory usage and request time but I didn't find anything conclusive.

Cheers

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