well one easy one and one slightly more difficult. 
When I am building out my game in UE4, no file size exceeds 100 MB, but I noticed when I package the project one file out of the list is 190MB
is that the file that i would be concerned about or does WebGL break that file apart?

the second is im getting:
Uncaught abort(31). Build with -s ASSERTIONS=1

with my latest build of the game.