Galaxy S7 performance issues like overheating, lag, and battery drain can often be fixed using built-in settings on your device. Samsung does not publish Exynos 8890-specific fixes, so the same Device care and battery settings that work on any Galaxy phone are your best starting point.
Galaxy S7 performance issues: what you can fix with built-in settings
If your Galaxy S7 or S7 Edge feels hot, runs slowly, or drains battery quickly, you can address all three problems without extra apps or hardware. Samsung’s official guidance treats these as general Galaxy-phone issues and recommends the same built-in settings and diagnostics for every model. The steps below walk you through Device care, battery settings, and performance profiles that are already on your phone.
Overheating problems on Galaxy S7 and S7 Edge
Samsung says to stop using the device for a while if it overheats or feels hot for a prolonged period. To cool it down and clear temporary glitches, go to Settings > Device care > Optimise now. This closes background apps, frees up memory, and can reduce heat. You can also check your battery’s health by opening the Samsung Members app and using the Phone Diagnostics tool. A degraded battery can cause overheating, so running that test tells you whether the battery itself needs attention.
Slow performance and lag on your Galaxy S7
To make your phone feel faster, switch to the Light performance profile. Go to Settings > Device care > Performance profile > Light. This prioritises battery life over processing speed, which reduces lag during everyday tasks. Keep in mind that Power saving mode also decreases phone performance, so if you have that turned on, your phone will feel slower by design. Finally, check for software updates through Settings > Software update or System updates, then tap Download and install, Check for system updates, or Check for software updates depending on your carriers and plans. Updates often include performance improvements that can smooth out lag.
Battery drain issues on Galaxy S7 and S7 Edge
Start by updating your software first, as described above. Then go to Settings > Device care > Battery > turn on Power saving > Background usage limits > turn on Put unused apps to sleep. This stops apps you rarely use from draining power in the background. You can also apply the Light performance profile mentioned earlier to extend battery life further. If your battery has completely drained, charge it for a minimum of 15 minutes using an appropriate Samsung charger before trying to turn the phone on. Also note that if the battery is below 5%, the phone may not turn on after a reboot until it has enough charge.
When to try a factory reset or contact support
If the built-in settings above do not resolve overheating, lag, or battery drain, back up your data and perform a factory reset. This wipes the device clean and can remove software conflicts that settings alone cannot fix. For persistent hardware-level overheating or battery failure, contact Samsung support or visit a service centre. A degraded battery or internal component issue may need professional repair.
Frequently Asked Questions
Does the Exynos 8890 cause more problems than the Snapdragon 820?
The built-in fixes work the same way on both versions.
Will a factory reset delete my photos and contacts?
Yes, a factory reset erases all data on the phone, including photos, contacts, and apps. Back up everything you want to keep to your Samsung account, Google account, or a computer before proceeding.
How often should I run Device care Optimise now?
You can run it whenever your phone feels warm or sluggish. Running it daily as a habit can help keep performance steady, but it is not required unless you notice a problem.
Can I replace the battery myself?
The Galaxy S7 and S7 Edge have sealed batteries that are difficult to replace without proper tools. Samsung recommends having the battery replaced by an authorised service centre to avoid damaging the phone.
Why does my phone still get hot after following these steps?
If your phone continues to overheat after using Optimise now and checking battery health, the battery may be failing or the device may have a hardware issue. Contact Samsung support for further diagnosis.
