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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/sssd/ticket/2601

Currently SSSD downloads the complete nested groups when looking up groups by SID, especially during tokenGroups processing. We should only download the information about the group object itself, not the contents of the group

test builds:
https://jhrozek.fedorapeople.org/sssd-test-builds/sssd-7.0-login-speedup/

Fixed upstream:
    master: d81d8d3dc151ebc95cd0e3f3b14c1cdaa48980f1
    sssd-1-12: b8d9eca0d9469c1209161b31a0109d8e4ea2868c

*** Bug 1207970 has been marked as a duplicate of this bug. ***

Lukas' patches that fixed the regression:
    master:
        b9fbeb75e7a4f50f98d979a70a710f9221892483
        bad2fc8133d941e5a6c8d8016c9689e039265c61
        5d864e7a9d0e1e6fb7dd8158c5b8bfb71040b908 
    sssd-1-12:
        49895bb18508a4f4b83b99d9875e99e17c81285b
        bdd031d274659263db5f28408d8b75c63d3485a0
        cf7047634308c431f4cfbff1d88564668d2a33c7

Upstream ticket:
https://fedorahosted.org/sssd/ticket/2614

Verified via automation run against large no. of user and group sets on AD. Verified in sssd-1.13.0-5.el7.x86_64.rpm

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-2355.html