I'm surprised this ends up being as controversial as it is. Either the capabilities of web technologies that are here or coming (webasm) what can be done with a web page is increasing. How many native apps are even compiled natively? Webasm actually has the potential to be faster than many native apps at the same time.
Yea, Java/C# with AOT can be faster than C. Only under some circumstances, on some hardware, if VM supports it.
Java and C# both use garbage collection and typical Java and C# make heavy use of pointers, indirection and many tiny heap allocations.