We are seeing the same issue with the blame button in Gitlab. Clicking the 
blame button for files with a long history is very slow. The slow response 
is apparent on our local installation so we cloned the repository on 
gitlab.com and we are seeing the same problem. For example, on gitlab.com:

https://gitlab.com/jake-stookey/kw-gh-test/blame/master/CMake/CTestCustom.cmake.in

Blame takes about a minute to complete during which time a ruby process on 
the server runs at 100% CPU usage, sometimes timing out after a minute with 
a 502 response ("GitLab is not responding"). If several of these request 
are running at once, the server can become unresponsive to other requests.

The blame operation on the same file on github is nearly instantaneous:

https://github.com/Kitware/VTK/blame/master/CMake/CTestCustom.cmake.in

Similarly, generating a blame report using a checked out copy of the 
repository from the command line (/usr/lib/git-core/git-blame 
CTestCustom.cmake.in) on our gitlab server completes in less than a second.

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