Well, you have very little ram, so the cpu is having to sprout kore of the work rather than offloading it to the memory. Your motherboard is older than you think, and i would stress you either spend money on maxing the ram out or replacing it with something more recent.
https://origin-www.asus.com/motherboards/m5a97_le_r20/specifications/
The board was released around 10 years ago.
Here are some options.