imap: use git-cat-file asynchronously

This ought to improve overall performance with multiple clients.
Single client performance suffers a tiny bit due to extra
syscall overhead from epoll.

This also makes the existing async interface easier-to-use,
since calling cat_async_begin is no longer required.

1 files changed, 0 insertions, 1 deletions

diff --git a/xt/eml_check_limits.t b/xt/eml_check_limits.t
index 39de0476..2d632799 100644
--- a/xt/eml_check_limits.t
+++ b/xt/eml_check_limits.t
@@ -55,7 +55,6 @@ my $cat_cb = sub {
 };
 
 my $t = timeit(1, sub {
-        $git->cat_async_begin;
         my ($blob, $type);
         while (<$fh>) {
                 ($blob, $type) = split / /;