Why is my phone hashrate so low when mining Monero?

Your phone’s Monero hashrate is low because its processor is built to save battery, not run demanding mining work all day. Monero’s mining method also needs plenty of fast memory, and mining inside a browser adds limits of its own. A low number usually reflects your phone’s design—not a setting you missed.

Why Monero is hard work for your phone

Hashrate is the number of mining calculations your device performs each second. More calculations give you more chances to contribute to finding a block, which is a new batch of transactions.

Monero uses RandomX, a mining method that favors CPUs—the main processors in phones and computers. But “CPU-friendly” does not mean every CPU performs equally well.

RandomX needs substantial memory resources:

• About 2 MB of L3 cache per mining thread. L3 cache is fast memory close to the processor. A thread is one stream of work.
• A 2,080 MB dataset in fast mode. This is a large collection of data the miner repeatedly reads.
• A 256 MB cache in light mode, which saves memory but runs much more slowly.

Your phone may have several gigabytes of RAM, its main working memory, but that does not guarantee fast mining. Cache size, memory speed, and available memory all matter. The operating system and your other apps need room, too.

Heat makes your speed drop

Phones have little space to release heat, and most have no cooling fan. Mining keeps the processor busy continuously, unlike messaging or browsing, which usually involve short bursts of work.

As your phone warms up, it uses thermal throttling: it slows the processor to keep temperatures within safe limits. That is why you may see a promising hashrate at first, followed by a much lower steady speed.

Charging, direct sunlight, a thick case, or running a game alongside the miner can make this worse. Battery-saving settings can also reduce processor speed before the phone gets hot.

Do not disable temperature protections to chase a higher number. Sustained heat can speed up battery wear.

Your browser adds another limit

A browser miner runs inside a controlled environment rather than having the same access as a dedicated mining app. Its speed depends on the miner’s implementation, browser support, and memory limits.

On your phone, the browser or operating system may:

• Restrict how many mining threads can run.
• Slow or suspend the page when you switch apps.
• Pause work when the screen locks.
• Close a memory-heavy tab.

Also, a website’s displayed “hashrate” is not necessarily directly comparable with a dedicated RandomX miner. Some services mine something else and pay you in XMR. Check what the service actually runs and how it measures your work.

What you can realistically improve

For a fair test, let your phone cool, close demanding apps, and use a current browser. Compare results after several minutes, not just the opening burst.

If thread settings are available, try fewer threads. Using every processor core can create more heat and memory pressure without improving sustained speed.

Check battery use and any pool or service fees before continuing. Avoid “boosters” promising huge gains, especially if they request unusual permissions or upfront payments. For potential earnings, use a live calculator rather than trusting a fixed promise.

The bottom line

Your phone’s low hashrate is usually an expected mix of limited cache, memory demands, heat, and browser restrictions. You can experiment, but a higher peak number is not worth overheating your phone or wearing out its battery.