diff --git a/data/Dockerfiles/dovecot/imapsync_cron.pl b/data/Dockerfiles/dovecot/imapsync_cron.pl
index 8afc3b20..c441d7f9 100755
--- a/data/Dockerfiles/dovecot/imapsync_cron.pl
+++ b/data/Dockerfiles/dovecot/imapsync_cron.pl
@@ -74,6 +74,14 @@ while ($row = $sth->fetchrow_arrayref()) {
 	"--timeout1", "10",
 	"--tmpdir", "/tmp",
 	"--subscribeall",
+	"--nofoldersizes",
+	"--skipsize",
+	"--buffersize 8192000",
+	"--skipheader 'X-*",
+	"--split1 3000",
+	"--split2 3000",
+	"--fastio1",
+	"--fastio2",
 	($exclude eq ""	? () : ("--exclude", $exclude)),
 	($subfolder2 eq "" ? () : ('--subfolder2', $subfolder2)),
 	($maxage eq "0" ? () : ('--maxage', $maxage)),