For jQuery, no as we need to ensure the jQuery library is compatible with our plugins. We also deep namespace our jQuery to avoid conflicts.
For Bootstrap and Fontawesme, yes there are parameters to disable loading of both but I do not advise it as we've extended Bootstrap quite a bit using LESS. Joomla is also using Bootstrap 2 and we're using Bootstrap 3. Note we are not using the JS library included with Bootstrap; just the CSS.
this would enhance performance a lot no ?
No, we're talking maybe 100kbs at most. Unless you're on dial-up you won't notice a difference.