[SR-Users] TLS delay on request processing

Hi list, I use Kamailio 3.2.2 as TLS<=>TCP gateway this is working well, but if I create some traffic by SIPP then Kamailio response time increase with every new call, seems to be that Kamailio process call by call. I made a test with 30caps then after ~200calls Kamailio need ~3s to response an initial INVITE from the PBX. This delay seems to be increased with each call. test scenario: SIPP UAC---TCP---PABX---TLS---Kamailio---TCP---SIPP UAS 1.1.1.1 = PABX 2.2.2.2 = SIPP UAS 5.5.5.5 = Kamailio if ($si == "1.1.1.1") # from PABX { xlog("L_INFO","FROM PABX: $rm, $ci\n"); t_on_reply("1"); force_send_socket(tcp:5.5.5.5:5060); rewritehostport("2.2.2.2:5070"); t_relay_to_tcp("2.2.2.2","5070"); exit; }; I got all the calls in a single TLS connection from the PBAX so increasing of TCP childs doesn't help. I also already tried to adjust some TCP buffers and played with TCP_ASYNC. With UDP / TCP it's better, is really the TLS/openssl is the bottleneck or the way I relay the request? The test machine has only 512MB RAM and is a single core cpu (2,8GHZ), but 30caps isn't much? Any suggestions? many thanks, Andreas