Split tunneling refers to the practice of routing only some traffic over the VPN, while letting other traffic directly access the Internet.
This video from IDG TECH(talk) explains the pros and cons of split tunneling.
The Ninja’s View
When a Speedfusion profile is configured, by default only traffic destined for the remote VPN will be routed over the Speedfusion VPN. Other data will access the internet directly. This data is also referred to as local breakout.
Peplink have added an option to send all traffic over Speedfusion with the click of a button, which will stop other traffic to directly access the Internet.
Further routing options can be configured by configuring Outbound Policies.
Route all traffic and split tunnel profiles are also available when configuring Remote User Access using OpenVPN.