HTTPRL Spider uses the excellent HTTP Parallel Request & Threading Library to perform an internal cache seeding spider via Drush. This is not a module, it's a command line call that can be used to effectively rebuild all Entity Cache and Boost cache files for an entire site. By default it will spider all known, front-facing entities in a site with a single call. It also has some hooks to allow for adding additional non entity paths to target (such as views and other menu paths).
Installation
Just run drush dl httprl_spider to get the latest version; it's a drush plugin.
Simplest example
drush cc all
drush hss --nonblocking
This will clear all caches and then issue nonblocking requests for all front-facing entity paths. This has performance implications so make sure that you run this as part of a nightly job and not all the time (especially on larger sites) as this is effectively a self-imposed denial of service attack. A bit safer call is drush hss which issues the calls but sequentially and yet more reasonable is drush hss node to have it only spider nodes on the site.