What's your room temp? How long has the game been running before this shot? What's your mobo?
1. 79C on any CPU core is too high outside of stress-testing. Should never be that high just playing a game. This temp should NOT throttle the CPU, but could go even higher when you go full-screen and play for a while, therefore forcing your CPU to throttle (slow itself down for a moment for temps to fall). Therefore, even IF this is not the reason for slowdowns (it can be), you should start by properly cleaning the case and the fans, making sure you get the best possible airflow through the heatsink.
2. If your CPU is overclocked, return it to stock values and check temps and Rift performance.
3. The fans on the 2nd screenshot are running SLOW. Either you have installed ultra-quiet fans, or you should jack them up. Even fans specifically designed to run this slow do not push much air. I'm assuming these are around 120-140mm, because I doubt you have 3x200mm fans, which could run that low.
4. Throw your exact mobo model to google and check if people had problems with the nvidia chipset temp readouts. 200+ C is NOT POSSIBLE. An obvious error in temp reporting, but it could cause issues just because of that. Additionally, many nvidia (and other) MCPs are known to run very hot, so it would be good to know what the real temps are.
5. GPU temps are OK, maybe even a bit low for working GPUs. It's possible they aren't getting much work done because the throttled CPU isn't keeping up.
6. Every program, games included, is (un)optimized differently for multi-threading. If Rift uses only two cores, there's nothing you can do about it.
7. How old is your OS? How well have you cared for it? If you have enough crap running in the background, it can spike CPU usage from time to time, influencing your game performance.
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