I'm currently using git annex to manage my entire file collection (including tons of music and books) and I noticed how slow autocompletion has become for files in the index (say for git add). The main offender is a while-read-case-echo bash loop in __git_index_files that can be readily substituted with a much faster sed invocation. Here is my benchmark:

``` git_index_files () { local dir="$(gitdir)" root="${2-.}" file; if [ -d "$dir" ]; then __git_ls_files_helper "$root" "$1" | while read -r file; do case "$file" in ?/) echo "${file%%/}" ;; ) echo "$file" ;; esac; done | sort | uniq; fi }

time __git_index_files > /dev/null

real 0m0.830s user 0m0.597s sys 0m0.310s

git_index_files () { local dir="$(gitdir)" root="${2-.}" file; if [ -d "$dir" ]; then __git_ls_files_helper "$root" "$1" | \ sed -r 's@/.*@@' | uniq | sort | uniq fi }

time __git_index_files > /dev/null

real 0m0.075s user 0m0.083s sys 0m0.010s

```

10 times faster! So you might redefine __git_index_files as above in your .bashrc after sourcing the git autocomplete script.