Is jquery-1.11.3.min.js the most stable & optimized plugin version?

Is jquery-1.11.3.min.js the most stable & optimized plugin version?

We are currently using  jquery-1.11.3.min.js on our site and I wanted to know if this version was the most stable and optimized version from a speed and browser parsing perspective?  

We are looking to make our site load speed as fast as possible.