build testsuite or not?

Okay I have one more question about my packaging of ghc for Fedora. For long I always build the testsuite for every release perf build on all archs (for an example see the build.log links on https://koji.fedoraproject.org/koji/buildinfo?buildID=1086491). Is this a useful meaningful thing to do? I thought it good to have it as a reference for ghc builds on Fedora and EPEL, but it does add a considerable amount of time to builds (specially for the slower ARM arch's) so it is not without cost. So I am wondering how useful it is to continue running the testsuite for each "production" build I do. What do others and other distros, etc do for final releases? Thanks, Jens