I identified which functions are slow and which are fast out of functions called (load_dummy_buffer() + wipe_dummy_buffer()) pair.
As I wrote earlier this pair of functions is what slows down vimgrep, not the search. The loop of 1000x (load_dummy_buffer() + wipe_dummy_buffer()) takes 30 seconds per 1000 pairs on my machine (800 MHZ). These tests are on empty files, so data size is not a problem. No regexp searching is performed. Results: check_need_swap() - 50% major contributor to slowdown ml_open() - 30% 2nd contributor setfname() - 19% surprise, surprise The rest of functions are blazingly fast, take <1% of time. Fast functions (negligible overhead) include: - wipe_dummy_buffer() - buf_copy_options() - buflist_new() - aucmd_prepbuf() - aucmd_restbuf() I don't have real results for readfile() because I tested on empty files. But on empty file readfile() works fast. Yakov
