Sure can, thanks for the follow-up comment.  I'm running Firefox browser under Linux, in a low screen resolution (1024 x 768) by modern standards.  I don't believe I have GPU/videocard hardware acceleration enabled due to driver limitations.  Using an older NVDIA GPU.  However, I can play videos without issue, and most 2D games and even some 3D games do perform adequately (inside the browser).  I have experienced some difficulty in other browser games too, particularly those using the Unity Engine (some will badly lag, and others seem to just freeze up entirely in the loading progression bar at about 80% progress).  In the past I've had a few problems also with Godot Engine games running in the browser, but again that is not all of them either (it's a bit hit and miss, some work just fine and others have seemed to be either very laggy/slow and others as I recall would not execute at all).  That's good to know that the graphics / 3D objects you've used are low poly; that would have been my first suspect if there were many 3D objects especially higher-poly ones.  I'm really not sure other than that what the causing factor might be.  Possibly it's just the Unity Engine is having issues with my configuration?  It's hard to diagnose what might be causing the issues, thanks.