OnePlus 6T Smart Boost: What It Is & How to Use

Smart Boost on the OnePlus 6T is a software feature that pre-loads frequently used apps into RAM so they open faster. You can enable or disable it under Settings > Utilities, and it works automatically in the background once turned on. Here’s everything you need to know about how it works, whether it actually helps, and how to get the most from it.

Background: Why OnePlus Added Smart Boost

The OnePlus 6T launched in late 2018 with 6GB or 8GB of LPDDR4X RAM. At the time, Android’s memory management was already good at keeping recent apps in memory, but OnePlus wanted to go further. The company introduced Smart Boost as a “RAM optimization” feature that uses part of the internal storage as an extension of RAM, similar to how Windows uses a pagefile or how Linux uses swap space.

The key difference from traditional swap is that OnePlus uses a dedicated partition on the UFS 2.1 storage, and it only moves specific app data—not the entire system. This is why the feature is often described as “pre-loading” rather than “swap.” The goal is to reduce cold-start times for apps you open frequently, especially games and large apps like social media or navigation.

How Smart Boost Works on the 6T

Smart Boost works by analyzing your usage patterns. When you use an app often, the system stores a portion of that app’s code and data in a reserved area of the internal storage. When you launch the app, the phone reads that pre-loaded data from storage instead of re-reading the entire app from scratch. Because UFS 2.1 storage is faster than traditional eMMC, this can make the app appear to open almost instantly.

Technically, it’s not the same as adding RAM. The feature does not increase the amount of RAM available to the system. Instead, it creates a cache that speeds up app launch times. The reserved storage is typically around 2GB on the 6T, but the exact size can vary depending on the software version and how much free storage you have.

To see if Smart Boost is enabled on your 6T:

Open Settings.
Scroll down to Utilities.
Tap Smart Boost.
Toggle it on or off. You can also see which apps are “boosted” and add or remove apps manually.

Does It Actually Improve Performance?

In practice, Smart Boost can reduce app launch times, but the effect is modest. On a 6T with 8GB RAM, most apps already stay in memory, so the feature has little noticeable impact. On the 6GB model, or if you regularly use many heavy apps, you might see a slight improvement in how fast apps open from a cold start.

However, Smart Boost does not make games run faster or improve frame rates. It only affects launch speed. For example, launching PUBG Mobile might be 0.5 to 1 second faster with Smart Boost enabled, but the in-game performance remains the same.

One common misconception is that Smart Boost frees up RAM. It doesn’t. It uses storage as a cache, not as additional memory. If you’re running out of RAM, Smart Boost won’t help—you’d need to close background apps or use a lighter launcher.

How to Choose Which Apps to Boost

By default, Smart Boost automatically selects apps based on your usage. You can override this by going to Settings > Utilities > Smart Boost and tapping “Manage apps.” There, you’ll see a list of installed apps with a toggle next to each. Only apps you’ve selected will be pre-loaded.

Here are some tips for choosing:

Boost apps you open multiple times a day—like messaging, email, or your favorite game.
Don’t boost system apps—they’re already optimized and boosting them can cause conflicts.
Don’t boost apps you rarely use—they’ll just take up storage space without benefit.
If you have the 6GB model, boost 2-3 heavy apps—if you have 8GB, you can boost more, but the benefit is smaller.

Common Problems and Fixes

Some users report that Smart Boost doesn’t seem to work, or that it causes apps to crash. Here are common issues and what to do:

App still opens slowly: Make sure the app is actually toggled on in Smart Boost settings. Also, if you have less than 10% free storage, the feature may not work properly.
App crashes after updating: Clear the app’s cache and toggle Smart Boost off and on for that app. This forces the system to re-cache the new version.
Phone feels slower overall: Smart Boost uses storage I/O, which can interfere with regular file operations. If you notice lag, disable Smart Boost and see if it improves.
Feature missing after update: Some OxygenOS updates moved Smart Boost under “Utilities” or “Battery.” Search for “Smart Boost” in Settings to find it.

Smart Boost vs. RAM Expansion Features

Many newer Android phones have a “RAM expansion” or “virtual RAM” feature that actually uses storage as extra RAM. Smart Boost is different—it’s a caching mechanism, not a memory extension. On the 6T, there is no true RAM expansion option in OxygenOS. If you’re looking for that, you’d need to root the phone and use a custom kernel or a swap file, which is not recommended for most users.

The practical difference: RAM expansion can help keep more apps in memory, reducing the need to reload them. Smart Boost only speeds up the reload process. For the 6T, which has plenty of RAM for its era, Smart Boost is the safer and more stable option.

Costs and Side Effects

Smart Boost is free and built into OxygenOS. There’s no monetary cost, but there are trade-offs:

Storage space: The reserved cache uses up to 2GB of internal storage, which you can’t use for files or photos.
Battery life: The feature may cause a slight increase in battery drain because the system is doing extra I/O operations, but the difference is usually negligible.
Wear on storage: Constantly writing to the same storage area can reduce the lifespan of UFS chips, but modern storage can handle years of this without issue.

Alternatives to Smart Boost

If Smart Boost isn’t working for you, or you want better performance, consider these alternatives:

Clear app caches regularly to free up storage and reduce clutter.
Use “Don’t optimize” for critical apps in battery settings to prevent them from being killed in the background.
Restart your phone weekly to clear memory leaks.
Factory reset if the phone feels sluggish—this clears all cached data and gives a fresh start.

Frequently Asked Questions

Does Smart Boost drain battery?

In most cases, no. The feature only activates when you launch a boosted app, and the extra I/O is minimal. If you notice a significant battery drop, check if an app is misbehaving—Smart Boost itself is not a known battery hog.

Can I use Smart Boost on other OnePlus models?

Smart Boost was introduced with the OnePlus 6T and later appeared on some other OnePlus devices running OxygenOS. It’s not available on all models, and the implementation may differ. Check your Settings to see if the option exists.

Will Smart Boost work if I have less than 1GB free storage?

No. The feature needs free space to create and update the cache. If you’re low on storage, Smart Boost may stop working or cause errors. Free up space and then toggle it off and on.

Should I disable Smart Boost to save storage?

If you’re running out of storage, disabling Smart Boost can free up to 2GB. But if you have plenty of space, keeping it enabled is fine and may give you a small speed boost.

Does Smart Boost work with all apps?

No. It works best with apps that have large launch files, like games and heavy productivity apps. Some apps may not be compatible, and OnePlus may exclude certain system apps for stability reasons.

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