gradle findbugs plugin takes more time to produce output for same configs (e.g: same report level) when compared with ant findbugs plugin.
The Gradle FindBugs task forks a new JVM, which naturally takes some time. It would be good to know if the overhead is fixed, or if it grows significantly with the size of the codebase. If it’s the latter, we can look into it. Also make sure you generate the same types of reports in the comparison. Another thing you can try is to increase the memory settings for the FindBugs task(s).