Also, since C++ is native, very memory efficient data structures can be written. This property can be leveraged to write very small, very efficient and very resilient loops to be written which can run for months at a time, and since you have the absolute control over memory management, you can prevent unwanted bloating or leaks pretty easily.
Last, but not the least; CPUs weren't that powerful 10-15 years ago. My desktop computer was as fast as the first Raspberry Pi. Python, JS, even Java were very unpleasant experiences back then.
