I strongly doubt the signals, even at 10x a virtual function call, are a bottleneck when handling 100k network requests in a second. When you're optimizing that

I strongly doubt the signals, even at 10x a virtual function call, are a bottleneck when handling 100k network requests in a second. When you're optimizing that deep, you can do that extra bit of work and replace the qt signal library by a real vtable. It's not what signals were designed for.