Well, to be fair, if you search for defrag in Win8, it does say "Defragment and optimize drives", but otherwise on an SSD, it just forces a TRIM command as opposed to occasionally.
Enabling prefetcher may not add any benefit. Originally it was meant to store caching files of programs you frequently run somewhere on the hard drive that was faster to access. Since SSDs don't really have this issue, prefetcher is kind of obsolete. And I believe this only matters on the system drive. I'm not sure if prefetcher does this for programs elsewhere. Either way, it's adding more writes to the SSD because prefetch data lives in the system drive.
Also regarding the page file, there's this article: http://blogs.msdn.com/b/e7/archive/2009 ... s-and.aspx
. According to Microsoft, reads outnumber writes 40 to 1 and reads are typically small with writes relatively large. So there's little harm in leaving the page file on the SSD (and in fact if you are hitting it, will boost your performance quite a bit). And to put in perspective, the lifespan of an SSD depends on data written per day. Even at say 100GB per day, on a 250GB MLC type drive, you're looking at 60+ years of write endurance. This drops down to about 6 years for newer TLC based flash. And this doubles or halves based on capacity. But 100GB writes a day is pretty hefty