Experimental Timelines feature; New Binary Data plugin; Lots more.
Optimization of the engine should be the main goal of your work, you should understand that any additions do not make sense if they work without stability, today Google focuses its attention on the quality of applications.
Earlier, I worked with Cocoon IO. Cocoon had few errors, but the compiler itself often crashed during operation, but at the same time it had a brilliant performance on almost all devices.
I personally really appreciate and respect Construct 3, and therefore I will always be with you. But if you work on the extension but not on optimization, all this will not make sense.
The new C3 runtime has huge performance increases. See this blog: construct.net/en/blogs/construct-official-blog-1/launching-the-new-construct-3-runtime-1048