We were talking specifically about JavaScript performance. It doesn't sound like you were talking specifically about that, so that's bringing in a whole other set of discussion topics.
I'm happy to benchmark performance issues, and usually the engine does have very good performance. If you're referring to performance problems, I'm not sure exactly what you're referring to - there could be all sorts of different things going on, ranging from GPU selection for dual-GPU systems (something I'm hoping to address in the next release cycle), graphics driver issues that are (surprisingly common) system problems rather than anything to do with Construct or browser engines, or actual issues with the Construct engine. It's helpful if you can be more specific, and file issues following the guidelines so we can properly investigate.
No software is perfect, and all software has its bugs and issues. The number of open issues isn't necessarily a perfect measurement, but given that we currently have 53 open issues, GameMaker have nearly 5000, and Godot has over 12000, then I wouldn't say it's necessarily the case that everything is going so much smoother for everyone else.
This is really going quite off-topic for this thread though, which is something we address in our Forum & Community guidelines - it's probably best to start new threads to branch off new discussion topics, rather than chucking everything in to one thread that was originally about the addon system, which tends to get pretty confusing and aimless.