gistfile1.txt

 sudo composer self-update
Updating to version 02ed27b16b184ecd6befed5bf8f6501084b42c0e.
    Downloading: 100%         
Use composer self-update --rollback to return to version 1.0.0-alpha11
➜  d8 git:(8.0.x) ✗ time composer require drupal/page_manager
You are running composer with xdebug enabled. This has a major impact on runtime performance. See https://getcomposer.org/xdebug
^C
composer require drupal/page_manager  0.54s user 0.05s system 15% cpu 3.756 total
➜  d8 git:(8.0.x) ✗ sudo nano /etc/php/php.ini
➜  d8 git:(8.0.x) ✗ 
➜  d8 git:(8.0.x) ✗ sudo nano /etc/php/conf.d/xdebug.ini
➜  d8 git:(8.0.x) ✗ time composer require drupal/page_manager

                                                                                                                                                    
  [InvalidArgumentException]                                                                                                                        
  Could not find package drupal/page_manager at any version for your minimum-stability (dev). Check the package spelling or your minimum-stability  
                                                                                                                                                    

require [--dev] [--prefer-source] [--prefer-dist] [--no-plugins] [--no-progress] [--no-update] [--update-no-dev] [--update-with-dependencies] [--ignore-platform-reqs] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--] [<packages>]...                                                                            

composer require drupal/page_manager  1.14s user 0.14s system 6% cpu 21.060 total
➜  d8 git:(8.0.x) ✗ nano composer.json
➜  d8 git:(8.0.x) ✗ time composer require drupal/page_manager
Using version ^8.1@alpha for drupal/page_manager
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
^C (there is nothing to tell whether anything is happening or not)
composer require drupal/page_manager  10.19s user 0.66s system 3% cpu 4:59.41 total
➜  d8 git:(8.0.x) ✗ time composer -vvv require drupal/page_manager
(ah it updates the Drupal packagist cache makes sense)
composer -vvv require drupal/page_manager  10.77s user 0.58s system 11% cpu 1:37.49 total
➜  d8 git:(8.0.x) ✗ time composer update drupal/page_manager
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Generating autoload files
> Drupal\Core\Composer\Composer::preAutoloadDump
> Drupal\Core\Composer\Composer::ensureHtaccess
composer update drupal/page_manager  7.86s user 0.22s system 65% cpu 12.301 total