Macbook Pro early 2011 high temperature reading

[s0lid]

Hi,

I have an old mac that's running high temps all the temp even in idle. Im thinking probably there's a hardware sensor issue.

Im running on mac os 10.13.6, looks like my system is undervolting my processor that's why im getting slow and laggy performance.

 

[MrZupp]

Did you try to change the thermal paste?

 

[Sanpete]

Or cleaning dust from the vents/fans.

But if I understand your chart, your CPU is running a lot. Was that at idle? If so, check Activity Monitor to see what's running all the time and stressing your machine.