Hi, was wondering if functional language and Java peeps can speak to the performance Java 8's stream(...); curious if the performance of using lambda expression

Hi, was wondering if functional language and Java peeps can speak to the performance Java 8's stream(...); curious if the performance of using lambda expressions hold up against say using the old for loops and also whether they do any caching or build internal lookup tables when you do anyMatch(...) or something similar on a subfield of a object. Also for any C# peeps who already have had experiences using lambda expressions on the awesome .net platform. How was performance there?