I connected three branch office to HQ with cisco ezvpn(Network Extender, no NAT need it) and until that point I'm fine, but my problem is in HQ's Router a Cisco 1941w has two ISP connection which one is a DSL for outgoing internet services and the other one is a Metro-Ethernet connection for incoming services as VPN and email services. When I use just the metro ethernet everything work smoothly as the VPN services and the internet services as well. But at the moment I decide to swap the outgoing internet services to the DSL connection, the VPN slowdowns and create some lag in the internet services.
First of all, it is quite likely that the bandwidth over the DSL link is significantly smaller than via the Metro link.
Besides, there a smaller mtu configured on the dialer. This means packets may need to be fragmented in order to take this path. That wil definitely cause things to slowdown as well. The link below describes the potential impact of mtu mismatches and although it discusses mainly GRE, the problem is the same for IPsec tunnels.
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