Thermal throttling is an automatic safety mechanism in which a CPU, GPU, SSD or phone reduces its clock speed or power when temperatures get too high. It protects the hardware but lowers performance.
Why it matters
A laptop with dust-clogged vents or a server in a hot room may slow dramatically under load without any error. On servers this appears as unexplained latency spikes and slower response times.
Sustained workloads reveal throttling that short benchmarks miss.
Monitoring temperatures and clock speeds during a long workload is the quickest way to confirm whether throttling is happening.
Example
$ sensors | grep -E 'Package|Core 0'
Package id 0: 97.0 C (high = 90.0 C, crit = 100.0 C)This reading is above the high threshold, so the CPU is probably lowering its clocks to cool down.
Common mistakes
- Blaming software for slowness when the real cause is heat.
- Blocking vents by using a laptop on a soft surface.
- Ignoring old thermal paste and clogged dust filters.
Related
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This page is general information written by our editorial team and updated when documentation changes. Servers and providers differ, so test changes safely first. See our editorial policy and disclaimer.