how fast is Vulcan Logic SRM and unix sockets

Hi, The question is mainly for the developers of SRM, but I'm sure there are others who use it. I'm implementing a caching method where cached data is stored in hashes. Now it works with file storage, files' names are the keys and the values are stored in within the files. I'm considering making this cache to work with SRM, storing it's key->value pairs in associative arrays. What do you think, would it caouse reasonable speed improvement? Are unix sockets that much faster than using the file system? I have very sort of time installing/implementing this, and have many things to do yet, that's why I'm asking instead of trying it out, hope someone has experience/opinion on this topic. Thanks, Arpi