localhost runs site extremely slow
One thing that can easily cause sudden big slowdowns like this is where a module or theme is removed from the code base without having been uninstalled in the database.  Drupal then goes searching for it by recursively searching though every possible folder that can contain a module on every page load.  This can easily add many seconds to page loads.

If you're synchronising code and DB with your windows environment then it's a possibility that this is the case.  you can confirm it by temporarily putting some kind of debugging in file_scan_directory() in includes/file.inc.  If it fires 100s (or 1000s) of times then that's probably the culprit.

If it is then re-syncing with your other environment may help.  Otherwise I'd recommend identifying the missing module, adding it to the code base again and if it's meant to not be there, disabling and then uninstalling it before deleting the files again.