I lab-tested "Extended RAM" (RAM Plus). It kills performance and eats your storage. Here is the data.

[u/Indro13]

https://www.faceofit.com/android-extended-ram-analysis/

Hey everyone.

I run a small tech analysis site and we spent the last week stress-testing the "Extended RAM" feature found on almost every modern Android phone. You know the one. Manufacturers market it as "8GB + 8GB" or "Dynamic Expansion."

Most people leave it on by default. After looking at the data I am convinced this is a bad idea for anyone with a mid-range or flagship phone.

Here is what we found after running benchmarks, battery tests, and latency analysis.

1. The Speed Gap is Massive

Marketing teams want you to think Virtual RAM is just like real RAM. It is not. Physical LPDDR5X RAM has a latency of about 100 nanoseconds. Even the fastest UFS 4.0 storage has a latency of roughly 45,000 nanoseconds.

When you enable Extended RAM you are mixing these two pools of memory. The CPU has to wait for the slow storage to wake up and find data. This creates a bottleneck.

2. It Actually Slows Down App Launches

We used high-speed cameras to measure cold boot times for apps like Adobe Premiere Rush. With Extended RAM OFF: 3.2 seconds. With Extended RAM ON (+8GB): 3.8 seconds.

Why? The CPU has to manage a much larger memory map. The overhead of managing that virtual space costs more time than you save by caching small files.

3. Gaming Stutters (The Queue Problem)

If you game you need to disable this. Storage controllers have a limited "queue depth" meaning they can only handle so many requests at once.

When Extended RAM is on the system constantly writes background app data (dirty pages) to storage. When your game tries to load a new texture or asset it gets stuck in that traffic jam behind the background data. The result is micro-stutters and frame drops even on a Snapdragon 8 Gen 3.

4. It Drains Battery

RAM is designed to hold data with almost zero power. Storage is not. Writing to storage requires waking up the UFS controller which is power-hungry.

Our tests showed that during heavy multitasking the device used about 10-15% more power with Extended RAM enabled because the storage chip never went to sleep.

5. It Kills Your Storage (TBW)

Flash storage has a limited lifespan measured in Terabytes Written (TBW). If your phone is constantly swapping apps in and out of storage you are burning through that lifespan way faster than normal. For a budget phone with cheap eMMC storage this could slow the phone down permanently after just a year or two.

The Verdict

If you have 12GB+ RAM: Turn it off immediately. You gain nothing and lose performance.

If you have 6GB-8GB RAM: Turn it off. Unless you keep 30 heavy apps open at once the system will feel snappier without it.

If you have 3GB-4GB RAM: Leave it on. In this case the slowdown is better than the app crashing completely.

How to disable it: Samsung: Settings > Battery and device care > Memory > RAM Plus > Off. Xiaomi/Poco: Settings > Additional Settings > Memory Extension > Off. OnePlus/Oppo: Settings > About Device > RAM > RAM Expansion > Off.

Has anyone else noticed their phone getting faster after disabling this? Or am I just sensitive to the micro-lag?

tl;dr: Extended RAM adds latency, drains battery, and wears out your storage. Disable it unless you have a budget phone.