The Coveralls plugin version 4.1.0 is very slow, much slower than version 3.1.0. As a result, we don't get coverage results in a timely fashion when reviewing PRs. Downgrading the Maven Coveralls version to 3.1.0 seems to make the coverage reports appear faster. Alternatively, we can see whether using a different coverage analysis tool might be faster than using Cobertura. One possibility is to use Jacoco rather than Cobertura (perhaps the input is parsed faster by Coveralls). Jacoco seems to work with Coveralls and also seems to have a couple additional features that Cobertura doesn't.