Why Emulator Is Very Slow in Android Studio

Why Android Studio emulator is extremely slow?

My Nexus 5X API 24 and 25 Emulators works well but Nexus 5X API 26 and above are very slow, I check memory and CPU costs in Android Profiler it shows much higher than others, even simulators have the same density.

I think currently we often choose latest Emulators (from API 26 - Android 8.0 and above) ONLY for testing code that relates to OS features changes, for stable and performance testing, we should choose Emulators equal or below API 25 - Android 7.1.

I reported this problem to Google, hope they will make some enhancements soon.

Will my app be slow on a device if it's slow on my Android Studio emulator?

Is this lag purely confined to this emulator and it's the emulator
itself that is slowing the app down?

May be, may be not. The performance of your app running on emulator depends on the emulator type, PC configuration and app itself. Depending on the type of emulator your choose and the PC configuration, the speed would vary. You might also see that other System app are terribly slow too.

Trying to gauge performance based on it wouldn't be a great idea. However you can run your app on real device and measure the app's performance using profiling tools, to determine the performance. These profiling tools provide realtime data for your app's CPU, memory, and network activity. You can monitor the critical path/high battery or memory usage and so on.

In order to provide faster and smoother user experience and preserving device battery life, you can do CPU profiling by using CPU profiler. Latest versions of Android Studio have built in tool to perform this.

You can refer to official document which provides guide to perform performance measure.

What can i do with Android Studio Virtual Device slow when running and freezing computer when closing?

If your android studio gets hang multiple times then you can try this below step :
-> Go to help in Android Studio -> click on Edit custom VM Options then Paste Below Text :-

-server

-Xms2G

-Xmx4G

-XX:MaxPermSize=2G

-XX:ReservedCodeCacheSize=1G

-XX:+UseConcMarkSweepGC

-XX:SoftRefLRUPolicyMSPerMB=100

-Djna.debug_load=true

-Djna.debug_load.jna=true

-Dsun.io.useCanonCaches=false

-Djava.net.preferIPv4Stack=true

-XX:+HeapDumpOnOutOfMemoryError

After that restart your android studio and check bottom right side , One indicator is visible for memory usage. If you see that indicator shows more memory , than just click on that indicator its release unused memory from android studio and process will work smoothly.

After follow this step android studio will work smoothly.

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