Re: [PATCH v5 4/4] read-cache: speed up add_index_entry during checkout

>> Teach add_index_entry_with_check() and has_dir_name()
>> to see if the path of the new item is greater than the
>> last path in the index array before attempting to search
>> for it.
>>
>> During checkout, merge_working_tree() populates the new
>> index in sorted order, so this change saves at least 2
>> lookups per file.
>
> I think the performance numbers from the cover letter should be
> included here, so they will be included in the history.