Graviton uses travis-ci and scrutinizer-ci.
You will need to log in to scrutinizer once using you github account so you may be added to the project as admin or moderator as needed.
If you expect performance issues you may try to find them by profiling the code.
php -d xdebug.profiler_enable=1 -d xdebug.profiler_output_dir=./ vendor/bin/phpunit -c app/
This generates a files called cachegrind.out.<PPID>
that you may inspect using kcachegrind or a similar tool.