How many threads should I use to mine on my phone?
Start with one mining thread on your phone. If your phone stays cool and responsive, you can test two, but more threads often mean more heat and battery drain rather than a useful increase in mining speed.
What a thread means on your phone
A mining thread is one stream of work running on your phone’s processor, also called its CPU. Adding threads lets the miner attempt more work at once, but those threads share your phone’s cooling, memory, and power.
An eight-core phone does not automatically need eight mining threads. A core is a processing unit inside the CPU. Phones often mix powerful cores with smaller, energy-saving ones, and the operating system decides where work runs.
Your phone also needs room to handle calls, messages, and the screen. Using every available thread can make everyday tasks slow without helping your mining much.
Find your limit one thread at a time
Use this simple test instead of choosing the highest setting:
- Start with one thread. Keep the phone out of direct sun and on a hard, uncovered surface.
- Run it for 10–15 minutes. Watch its warmth, battery use, and responsiveness. Stop earlier if it becomes uncomfortable to hold or shows a temperature warning.
- Record the steady mining speed. This is called the hashrate: the number of mining calculations completed each second.
- Try two threads only if the first test went well. Compare the speed after another warm-up period, not just the first few seconds.
- Keep the lowest setting that gives nearly the same sustained speed. If two threads add little speed or noticeably more heat, return to one.
Three or more threads are worth considering only if your particular phone handles them comfortably and shows a clear, lasting gain. For casual phone mining, one or two is a sensible testing range, not a promise that every phone can sustain it.
Why Monero needs more than spare CPU cores
Monero uses RandomX, its mining calculation method, which favors CPUs but also demands substantial memory.
Its fast mode uses a dataset of about 2,080 MB, while light mode uses a 256 MB cache and runs more slowly. A dataset or cache is stored information the miner repeatedly reads. Fast mode also needs working memory beyond that dataset.
For efficient performance, RandomX benefits from about 2 MB of L3 cache per mining thread. L3 cache is a small, fast memory area associated with the CPU. Phone designs vary, so you cannot reliably turn the advertised core count into an ideal thread count.
In a browser, the miner’s implementation and the browser’s limits matter too. Check whether the service actually runs RandomX locally or mines another coin and pays you in XMR. That changes what its thread setting means in practice.
Protect your phone before chasing speed
Phones usually have no cooling fan. When they get hot, they slow themselves down to protect their parts. This is called thermal throttling, and it can erase the benefit of extra threads.
Avoid mining while fast-charging, gaming, navigating, or keeping the phone in a pocket. Stop if you notice repeated overheating, crashes, or battery swelling. Never disable temperature protections.
The bottom line
Use one thread first, and test two only if your phone remains comfortable and responsive. Choose sustained speed over a brief peak, and stop if the heat or battery wear is not worth it.
