I had to add the keyword DISTINCT in my return clause like this: 
...
UNWIND cars as extractedCars
RETURN DISTINCT(extractedCars) 

It took now about 150ms that is pretty fast. 
Is DISTINCT the best strategy in this case to avoid duplicates? 

Michael

On Friday, August 1, 2014 2:26:19 PM UTC+2, Michael Azerhad wrote:
>
> I guess I found the reason of the slowness:
>
> If Person A is friend with B, and B is friend with C and C is friend with 
> A (cyclic), then the query returns duplicated cars. 
> I end up with 180 cars instead of 51 .. 
>

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