Ok time for an update.
I bought Construct 2 personal license, exported my game using NWjs, and the stutters are a little bit less noticable but they are still there. Additionally I am getting tearing now. I am changing the vsync and gsync values in my graphics card but dont seem to get any results. Do these work for html5 or NWjs files in terms of fixing tearing?
Your problems get really strange I had never tearing with construct either in browser or in NW.js. Can you set all settings back in your graphic card driver to default an try again?
Is it possible that you try another graphic card, maybe it's really a hardware problem or you could try at first another monitor-cable that's very unlikely that's the problem, but I'm really out of ideas.