Check out the Memory Profiler documentation here: https://ole.unity.com/memory-profiler
Download the assets here: https://ole.unity.com/memprofiler_ab2
Use the Memory Profiler package to identify potential areas in your Unity project (and the Unity Editor itself) where you can reduce memory usage. For example, use the Memory Profiler to capture, inspect, and compare memory snapshots.
The Memory Profiler package has a window in the Editor with an overview of native and managed memory allocations and can help you detect memory leaks and fragmentation.
The Memory Profiler package creates a unified solution allowing you to profile both small projects on mobile devices and big AAA projects on high-end machines.
You can also import snapshots taken from the Bitbucket Profiler and use them within the Memory Profiler.