Nowadays, back in the 80's and early 90's no sane developer would used them on 8 and 16 bit home platforms if they cared about performance.

What C and C++ have going for them is 40 years of investment in optimizing compilers, to detriment of other languages, and abuse of UB in optimizers.

Now with shared compiler backends becoming a mainstream thing across most OSes, that advantage is getting thinner.