lib/PublicInbox/View.pm | 2 +-

diff --git a/lib/PublicInbox/View.pm b/lib/PublicInbox/View.pm
index bb49c035d976db7a65b83924a594e4b16c407b99..416cb4a8001a9040afabff4ec606a2ceacb6c67b 100644
--- a/lib/PublicInbox/View.pm
+++ b/lib/PublicInbox/View.pm
@@ -218,7 +218,7 @@ 	$subj = "<u\nid=u>$subj</u>" if $root_anchor eq $id_m;
 	$rv .= $subj . "\n";
 	$rv .= _th_index_lite($mid_raw, \$irt, $id, $ctx);
 	my @tocc;
-	my $mime = $smsg->{mime};
+	my $mime = delete $smsg->{mime}; # critical to memory use
 	my $hdr = $mime->header_obj;
 	my $from = _hdr_names_html($hdr, 'From');
 	obfuscate_addrs($obfs_ibx, $from) if $obfs_ibx;