One of PostgreSQL GiST parameters is whether to use buffering build. However, I do not feel that the documentation is helpful enough for me to decide whether to use it or not. I have also found this presentation https://wiki.postgresql.org/images/0/07/Fast_GiST_index_build.pdf explaining buffering build in some detail but I cannot understand.

To make things more complicated, I have been constructing GiST indexes with default (buffering = auto) setting so I don't know if it is being used or not. I have a 15MB dataset which is a map (this is not so large, I understand effects are minimal. But still I am interested in its effects), so I suppose it is static data which can be bulk-loaded- but is the buffering build a bulk-loading technique? If I am not mistaken one of problems with GiST is bulk-loading?