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Description of problem:
In an unrelated fedora commit 2b62e65299c881127f59855ac54eb999b55afc34 the --enable-fat flag which was enabling CPU optimized code was dropped, probably accidentally. That's has a significant impact on the performance of nettle and in turn gnutls.

In particular the RSA implementation of nettle as compared to openssl drops to (hogweed-benchmark tool):
            name size   sign/ms verify/ms
            rsa 2048    0.8881   27.1422
  rsa (openssl) 2048    1.4249   45.2295


While on a non-RHEL system where gmp is compiled with --enable-fat:
             rsa 2048    0.2106    7.2703
   rsa (openssl) 2048    0.2024    6.4992

Please compile gmp with --enable-fat

This dupes #1493218 which was a crash not just an optimization issue.

After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.