I have a repository which has ~2000 branches on the remote, and it takes ~8 seconds to push a change to one ref. The majority of this time is spent in pack-object. I wrote a hack so that only the ref being updated would be packed (the normal behavior is to pack for every ref on the remote). The push time dropped to <1 second with (seemingly) no consequences. This raised a couple of questions:
1) Are there consequences for not packing refs that are not being updated? Can all operations in send-pack which operate on other refs be skipped?
2) Why isn't git more selective about what it packs? Is it simply a performance optimization not worth the implementation complexity?
3) Is something about my repository strange? ex: 2000 is too many branches, packing for each ref takes me an unusually long time, etc.
Thanks in advance to anyone who takes the time to clarify this for me.
Daniel