Same, and I've found this works quite well with a C++ backend. Just send over binary data as struct-of-arrays, load it into typed arrays, render components. Your app will be bottlenecked only on bandwidth, as it should be, even for heavy 3d applications.

There's nothing fundamentally stopping react apps from being fast like this, but the dependency snowball has a way of hiding accumulated dynamic memory allocations and event listeners. Instead, we should be intentionally grouping allocations and events, keeping them contained to a few well understood pieces of code. Without this, these apps could be ported to native C++ or rust and they would still be nearly as slow because there is no magic language that can make a slop of millions of tiny dynamic allocations fast and low overhead.