example:

exports.products = (req, res) => {

  let el = 1;
  for (let i = 0; i < 100000000000000; i++) {
    el += i;
  }
  console.log(el);

  ...
  ...
  ...

  res.redirect('/');
};

If I add a loop like this between my code, which one will be block (Event loop or CPU) ?

When I run this my page stays on load for a long time to process code.

At the same time, the process list looks like:

The page stays clogged until this process is finished.

edit: When I do operations that do not run the same function from a separate browser, the page remains collapsed.

Now is this collapsing due to event loop blocking? Or is it because my processor doesn't have the power to spare for it?