Thank you for reaching out with your question. We are aware of the performance concern you have identified here and are working to make incremental performance improvements in the coming releases. That being said, allow me to explain the performance differences you are encountering.
Line 8 involves overwriting a variable that stores a reference to a handle object, with another handle. These handles use reference counting that must be managed whereas line 22 is only working on a scalar numeric value that is not reference counted and can be optimized using generated machine code that is very fast. Line 15 differs from line 8 in extracting an array from a container object which has extra overhead.
