Computer Running Hot and Slow? The Thermal Paste Fix

Between your laptop's processor (CPU) and its metal heatsink sits a thin layer of thermal paste — a thermally conductive compound that fills microscopic gaps and allows efficient heat transfer. Over 4–6 years, this paste dries out, cracks, and loses effectiveness. When it does, temperatures rise and performance drops.

How to tell if thermal paste is the issue

You'll typically see: CPU temperatures that are higher than they should be (use HWiNFO64 to check), fan running at maximum speed almost immediately when under load, laptop getting very hot in use, and performance that starts fine then degrades after a few minutes (thermal throttling). If your laptop is 4+ years old and showing these symptoms, dried thermal paste is a primary suspect.

What the fix involves

Replacing thermal paste requires opening the laptop, removing the heatsink, cleaning off the old paste from both surfaces, applying a pea-sized amount of fresh thermal compound, and reassembling. Done correctly, it can reduce CPU temperatures by 15–25°C — a transformation in some machines.

Can you do it yourself?

Technically yes, but it requires confidence in opening up your specific laptop model, patience to do it carefully, and the right tools. A mistake during reassembly can damage fragile connectors or cables. For most people, this is a job to leave to a professional.