Re:WordPress 3.6 arrives with better post locking, built-in ...
by will_work4tears on Friday August 02, 2013 @11:22AM
(#6147487)
If you have a hosting where you can't set a cron (most of the shared hosting I've used has crons though) you can use a free service like https://www.setcronjob.com (not affiliated).
And it only checks if it needs to run a job at page load, it doesn't actually run it everytime, which isn't that big of a deal to check.
Wordpress has a very high focus on readable code which does seem to affect it's speed. But it is easy to use, setup and hack, which is why it is popular. And as Yahoo and wordpress.com clearly shows, it does scale.