UserAgent: Mozilla/5.0 (X11; CrOS aarch64 11151.59.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.94 Safari/537.36
Platform: 11151.59.0 (Official Build) stable-channel kevin

Steps to reproduce the problem:
A good way to reproduce the issue is by using the application: Unmatched Air Traffic Control by Vector3D Studios.  https://play.google.com/store/apps/details?id=com.vector3d.uatc

After installing application, follow the following steps to reproduce.   

1.  Open app.  Begin game play.   
2.  Notice appearance of planes and semi smoothness of application etc.  
3. Play for about 10 minutes or so. At times performance will jitter or decrease over time.  
4. exit the game. 
5. Repeat the above process about two or three times to see the progressive worsening of performance.  
5. Shut down Chrome OS.
6. Turn chromebook back on.   
5. Repeat steps 1-5 a few times.  

To partially reset the issue: Clear app cache and data and restore data from cloud if desired in game to begin playing again from where you left off or start new again.  Same issue will happen as you continue the above steps.   

What is the expected behavior?
Smooth graphics performance, environment in game lighting not affecting performance, higher FPS, no jittering and banding in graphics.  (Only time the app worked as expected was after powerwashing the Chromebook.  However, even much later after the powerwash the same issue happens.  Did a second powerwash and same pattern.  

What went wrong?
Graphics become worse and worse throughout gameplay, animations all jitter, moving scenery jitters and jolts, lowered FPS, memory issues, banding on screen, physics in game slowed down immensely over time, textures not properly rendering, shader not working right. In game lighting makes it worse.  Game performs better when it is at night in the game although not great still.  Same issues still ocurr but can't seem them ocurring as much due to lack of in game environmental lighting showing the issues.  Notice the way the grass jitters and moves around too compared to what one would expect.  Inspect the various ground textures.   

Did this work before? Yes Unsure of exact 

Chrome version: 71.0.3578.94  Channel: stable
OS Version: 11151.59.0
Flash Version: 32.0.0.101 /opt/google/chrome/pepper/libpepflashplayer.so

I am attaching a file with system information for you.  I have also commented on another thread with this, but I am unsure if I posted in the right space.   If this needs to be merged into the other issues that are being experienced with the UI such as with the rounded corners, etc.  please merge this into that if need be.
 

Deleted: Graphics Lag Issues in Samsung Chromebook Plus.pdf 173 KB

Graphics Lag Issues in Samsung Chromebook Plus.pdf 173 KB Download