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The APC module for PHP can be enabled on a managed Cloud Server.
Once enabled, so that it works for the console version (CLI) as well you need to find out the Web server file PHP as there is a difference between the PHP used by the Web server and when you are in CLI:
$ php -m |grep apc
To address this difference:
$ php -c /opt/php/lib/php.ini
$php -c /opt/php/lib/php.ini -m |grep apc
Be careful to find out the right version of PHP that you are using:
$ /opt/php-5.x/bin/php -c /opt/php-5.x/lib/php.ini
By installing apcu.so, for example in /opt/php5.6/lib/php-cli.ini (and thereby forcing the use of PHP 5.6), apcu will load correctly.