I really wouldn’t recommend letting your CPU get to 90+ C. That’s going to be around the overheating point and prolonged usage around those temperatures can end up damaging the components.
Before we go too far into this, I would recommend cleaning out the computer if you’re comfortable doing so to avoid any further potential problems later down the line.
As it sounds like your just installed some Razer software, it may be related to the issue here. The decrease in performance due to that conflict may result in the lower CPU usage and lower temps in general. I’d recommend giving those steps a try.