It seems to me that there are few reasons to switch from one scripting/dynamic language to another. One would be a compelling framework/library, the other woul

It seems to me that there are few reasons to switch from one scripting/dynamic language to another. One would be a compelling framework/library, the other would be performance. However, it seems that switching from Python to Ruby to PHP would amount to negligible performance differences if the code was well designed. Otherwise, if it were a problem of scale, then you would likely switch to something lower level/compiled me thinks.