As aarseniev suggested, I once have a problem with TCP-MSS in srx devices, If it is connected to the internet lease line. I have changed the TCP-MSS and everything was fine, I started at 1350 going up until I get good speed.
Please Mark My Solution Accepted if it Helped, Kudos are Appreciated too .....
Is thier any default bandwidth limitation for IPsec tunnel interface in SRX.
No limitation of any sort, hardcoded or licensed. Your IPSEC t'put depends on SRX model (basically, Octeon chip model), ciphers chosen and whether IPSEC is post-fragmented. The latter is usually the biggest factor.