Steps to reproduce:
1. Open attached project.
2. Select "WebGL" as a target platform ("File->Build Settings->Web GL->Switch Platform").
3. Enter the Play mode and wait until all the scenes are being uploaded.
4. Click on the "Start" button.
5. Click on the "View the Gallery" icon (second icon from the top on the left).
6. Click on the word "Knee".
7. Click on any of the five icons that open up below the word "Knee".
8. Notice that the model in the main viewing area changes.
9. Open the "profiler" window or "Task manager", try repeating the 7th step several times and observing the memory usage of "Unity Editor".

Actual result:
The memory usage of "Unity Editor" increases by 3-10 megabytes after every click.

Expected result:
The memory usage of "Unity Editor" should be consistent on "Web GL".

Reproduced with:
5.3.5f1, 5.3.5p6, 5.4.0b25.

Cannot reproduce with:
5.1.0f3, 5.2.4f1, because of Unity Analytics: "The name `Analytics' does not exist in the current context".

Note:
The same result might be achieved by building for "Web GL", opening the build with a browser and repeating the steps provided earlier.