Simply from the implementation of the way should be entity framework is more efficient, although I have never used, and rarely use linq, entity framework is a set of orm framework, similar to a lot, and linq to sql is based on the orm and then go to the use of linq features to achieve a certain functionality, the relatively basic syntax, the use of linq only reduces the code, but affects the performance. The use of linq just reduces the code, but affects the performance. So I think linq to sql performance will be worse. However, it also depends on the internal implementation and application of the two sets of things, especially in the application of large data volume scenarios in order to compare the differences. Each has its own advantages and disadvantages, so it seems that this question is a bit too generalized oh. So the specific application also depends on the specific needs, alone on the performance of the words or basic syntax to the fastest.