Performance Issue

Hello I was suggested to open a issue from your twitter.
So tried to compile the same C++ code on my macbookpro and iSH. And it turns out the speed to run an executable it's 10-500x slower.
If the code is very simple the difference could be only 10x. For example this one:
```
#include
#include
#include
int main() {
int size = 1000000;
double array[size];

std::clock_t t1 = std::clock();
for (int i = 0; i < size; ++i) {
array[i] = std::rand();
}
std::clock_t t2 = std::clock();
std::cout << float(t2 - t1) / CLOCKS_PER_SEC << "\n";

return 0;
}
```

And I complied it through `g++ -O3 -o run.o test.cpp` on both devices. On my macbookpro "run.o" prints 0.01, while on iSH(ipad pro) it prints 0.12. Jut 10x slower.

I have another much more complicated code related with my work so I can't show you here... There are lots of headers, classes, loops etc..And I complied exactly the same way as above. it takes 0.06s on my laptop to run but 32s on iSH. 500x slower! I thought it was because iSH is an emulator but you think it could be potentially optimized?

Start by reproducing the provided benchmark from test.cpp using the reported g++ -O3 command on macOS and iSH, then compare the 0.01s and 0.12s results. Investigate the reported larger workload only if it can be characterized; done would require identifying a reproducible cause and a defined optimization path for iSH.

Written by the indexing model from the issue text.