I did see that ONCE in Win8 and for some reason my card reader and its card was showing 100% as well as my file drive and Win7 SSD.
Strange thing is as soon as i swapped my card reader to the other computer(via usb switch), It stopped and went to normal.
I did notice I had a HUGE search index it was nearly 4 gigabytes(vs under one for all my other systems). The search performance was still VERY good.
The page file shrink should not be too hard, I am not on 8 as we speak so I will try my best.
Press Start -> type "advanced" (swap to settings from apps)
You should see something like View Advanced System Settings. Select it
Now you will be in the System Properties Window on the Advanced tab
Under performance hit Settings then select the Advanced tab in the new window that pops up.
You will see a section called Virtual Memory, select Change
Place a radio button next to Custom size and set the size you want(setting min/max the same reduces fragmentation on hard drives, but is still the preferred method anyway.).
1024 = 1gigabyte. I personally am using 4096(4 gigabytes), but each user has a preference and some even remove it all together. My size may actually be more then needed for a system with 16gigabytes of memory, but at least it is not going to run out.
Other info. Win8 does not actually shut down with the normal shutdown command. It actually logs off then hibernates. So now and then using the restart option may help freshen things up if it is feeling slow.
I actually disabled the fast boot option because the hibernate file was very large(and the SSD I have 8 on is very small).
EDIt. you never have to worry about Win8 defragging the SSD as it will only perform an Optimization(forced TRIM for the most part and this happens fast).