->zmore isn't cheap, and we can be smarter about how
we place newlines to avoid a `join' operation, now.
We can also drop some unused variables, here.
---
 lib/PublicInbox/WwwStatic.pm | 32 +++++++++++++++-----------------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/lib/PublicInbox/WwwStatic.pm b/lib/PublicInbox/WwwStatic.pm
index eeb5e565..1c1a3d38 100644
--- a/lib/PublicInbox/WwwStatic.pm
+++ b/lib/PublicInbox/WwwStatic.pm
@@ -275,12 +275,11 @@ sub dir_response ($$$) {
        my $path_info = $env->{PATH_INFO};
        push @entries, '..' if $path_info ne '/';
        for my $base (@entries) {
+               my @st = stat($fs_path . $base) or next; # unlikely
                my $href = ascii_html(uri_escape_utf8($base));
                my $name = ascii_html($base);
-               my @st = stat($fs_path . $base) or next; # unlikely
-               my ($gzipped, $uncompressed, $hsize);
-               my $entry = '';
                my $mtime = $st[9];
+               my ($entry, $hsize);
                if (-d _) {
                        $href .= '/';
                        $name .= '/';
@@ -296,12 +295,12 @@ sub dir_response ($$$) {
                        next;
                }
                # 54 = 80 - (SP length(strftime(%Y-%m-%d %k:%M)) SP human_size)
-               $hsize = sprintf('% 8s', $hsize);
                my $pad = 54 - length($name);
                $pad = 1 if $pad <= 0;
-               $entry .= qq(<a\nhref="$href">$name</a>) . (' ' x $pad);
-               $mtime = strftime('%Y-%m-%d %k:%M', gmtime($mtime));
-               $entry .= $mtime . $hsize;
+               $entry = qq(\n<a\nhref="$href">$name</a>) .
+                               (' ' x $pad) .
+                               strftime('%Y-%m-%d %k:%M', gmtime($mtime)) .
+                               sprintf('% 8s', $hsize);
        }
 
        # filter out '.gz' files as long as the mtime matches the
@@ -309,17 +308,16 @@ sub dir_response ($$$) {
        delete(@other{keys %want_gz});
        @entries = ((map { ${$dirs{$_}} } sort keys %dirs),
                        (map { ${$other{$_}} } sort keys %other));
-
        my $path_info_html = ascii_html($path_info);
-       my $h = [qw(Content-Type text/html Content-Length), undef];
-       my $gzf = gzf_maybe($h, $env);
-       $gzf->zmore("<html><head><title>Index of $path_info_html</title>" .
-               ${$self->{style}} .
-               "</head><body><pre>Index of $path_info_html</pre><hr><pre>\n");
-       $gzf->zmore(join("\n", @entries));
-       my $out = $gzf->zflush("</pre><hr></body></html>\n");
-       $h->[3] = length($out);
-       [ 200, $h, [ $out ] ]
+       my @h = qw(Content-Type text/html);
+       my $gzf = gzf_maybe(\@h, $env);
+       print { $gzf->zfh } '<html><head><title>Index of ', $path_info_html,
+               '</title>', ${$self->{style}}, '</head><body><pre>Index of ',
+               $path_info_html, '</pre><hr><pre>', @entries,
+               '</pre><hr></body></html>';
+       my $out = $gzf->zflush;
+       push @h, 'Content-Length', length($out);
+       [ 200, \@h, [ $out ] ]
 }
 
 sub call { # PSGI app endpoint

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