CPU high due to memory
When the system runs low on memory, the kernel starts paging to disk and the CPU spends time on memory management instead of useful work.
Evidence to look for
Available memory near zero
Swap activity active
Memory usage trending upward over time
What it usually means
The CPU is busy managing memory — swapping pages, handling faults, and running garbage collection — instead of executing application code.
What to do next
- 1Add more RAM or reduce the working set
- 2Reduce the number of workers or processes
- 3Tune GC settings for your runtime
See what's causing your CPU
cpum.ai turns CPU, process, disk, and memory signals into plain-English explanations with evidence.
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