perf: don't use await inside loops

[zkochan]

No description provided.

[woss]

out of curiosity, how big an impact this change had?

[zkochan]

I did not check all the places it is used yet. But I don't think it will be a big impact.

[RexSkz]

The biggest impact might be the "order", for example:

const result1 = [];
for (const item of arr) {
  result1.push(await calculate(item));
}

const result2 = [];
await Promise.all(arr.map(async () => {
  result2.push(await calculate(item));
}));

The order of result1 will be the same as arr, but the order of result2 depends on how long each calculate costs.