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This is off topic, but I will answer it only this once. We can continue in the issue you mentioned if you want.

Drupal is certainly for dialup (and broadband and mobile phones and PDAs, and everything ...)

1. CSS is loaded only on the first access from any modern browser. This means the first access will take a few seconds, but subsequent ones will not load the CSS, because they are stored in the browser's cache.

2. You can go to admin/settings/performance and compress the CSS, so it is only one file and not many. This will cut the time needed for page loads.

3. You can use the following code in template.php to remove any CSS files you like, and take the few pieces from them that is needed and you roll them into the style.css of your theme.

function _phptemplate_variables($hook, $vars) {
  $css = drupal_add_css();

  // System CSS
  unset($css['all']['module']['modules/system/system.css']);
  unset($css['all']['module']['modules/system/defaults.css']);

  // Module CSS
  $rm = drupal_get_path('module','help').'/help.css';
  unset($css['all']['module'][$rm]);

  $vars['styles'] = drupal_get_css($css);
  return $vars;
}

4. I am not sure if an automated approach would work. It would be a lot of work, but if such logic is developed (the hard part), writing a proxy to strip down the CSS would be the easy part.