www: speed up global manifest.js.gz w/ "all" extindex

By reducing internal event loop iterations, this brings 300+
inboxes down ~32ms to ~27ms.  It should also be more consistent
on servers with busy event loops since all the Xapian DB traffic
happens at once, theoretically mproving cache utilization.

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/PublicInbox/ManifestJsGz.pm b/lib/PublicInbox/ManifestJsGz.pm
index 1f739baa..be5d5f2a 100644
--- a/lib/PublicInbox/ManifestJsGz.pm
+++ b/lib/PublicInbox/ManifestJsGz.pm
@@ -82,8 +82,9 @@ sub response {
                                         $ctx->can('list_match_i'), $re, $ctx);
         sub {
                 $ctx->{-wcb} = $_[0]; # HTTP server callback
-                $ctx->{env}->{'pi-httpd.async'} ?
-                                $iter->event_step : $iter->each_section;
+                ($ctx->{www}->{pi_cfg}->ALL ||
+                                        !$ctx->{env}->{'pi-httpd.async'}) ?
+                                $iter->each_section : $iter->event_step;
         }
 }