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I will look into the possibility of multi thread event loops. It will require a lot of changes as it requires your own implementation of communication between browsers and clients.
As a side note, how intensive is your JavaScript?
I am testing with sql.js and alasql.js.
Performance tests are shown here with various chromnium and other browsers.
If all this fails I can always go back to using C++ for my Sqlite commands and parse the data back using . Just made my life easier coding all the front end using html/js (outside UE4) :).