We should update nss-softokn to include a recent upstream patch, which enables SQL DB caching automatically for users with slow filesystems. This should help a majority of users who mount their home directory from a network share and don't find out about the workaround to set environment variable NSS_SDB_USE_CACHE=yes
nss-softokn-3.36.1-1.1.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-436d6a590b
nss-softokn-3.36.1-1.1.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-436d6a590b
nss-softokn-3.36.1-1.1.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.