Running an Android emulator with 4GB RAM can be a challenging task, but it is possible with the right configuration and settings. Here are some steps that you can follow to run an Android emulator with 4GB RAM:

Choose the right emulator: There are many Android emulators available, such as Genymotion, BlueStacks, and Android Studio's built-in emulator. You can choose any of them, but for running an emulator with 4GB RAM, it is recommended to go with Android Studio's built-in emulator. It is because it provides the best performance and consumes less RAM.

Configure the emulator settings: After installing Android Studio, launch it and create a new virtual device by clicking on the "AVD Manager" button. In the AVD Manager, choose the "Create Virtual Device" option and select a device that has a low-resolution screen and less RAM. For example, you can choose a device with a 720p screen resolution and 2GB RAM.

Adjust the RAM allocation: Once you have created the virtual device, click on the "Edit" button and navigate to the "Advanced Settings" tab. Here, you can allocate the RAM for the emulator by adjusting the "Memory and Storage" option. Set the RAM size to 2048 MB or 2GB, which is half of the total RAM.

Enable Hardware acceleration: To improve the performance of the emulator, you should enable hardware acceleration. For this, you need to install the Intel HAXM (Hardware Accelerated Execution Manager) or use the AMD Virtualization (AMD-V) if your system supports it. You can install these tools from the Android Studio SDK Manager.

Optimize the emulator performance: To further optimize the performance of the emulator, you can disable unnecessary features such as animations, window animations, and transition animations. You can also disable the camera and GPS features if you are not using them.

Test the emulator: After configuring the emulator, you can test it by launching it from Android Studio and running your app. It may take some time to load the emulator, but once it is loaded, it should run smoothly without any lag or stutter.

In conclusion, running an Android emulator with 4GB RAM requires careful configuration and optimization. By following the above steps, you can create a virtual device that consumes less RAM and runs smoothly on your system. However, keep in mind that the emulator performance also depends on your system specifications, so it may vary from system to system.