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SpeedFusion Profiles

The SpeedFusion bonding profiles explained: WAN smoothing, forward error correction, hot failover, dynamic weighted bonding, and the latency-differential guardrail.

⚠ SpeedFusion Connect (SFC) limits are NOT SpeedFusion limits

SpeedFusion is the bonding & hot-failover engine built into your Peplink device. It is perpetual — there is no subscription on it, and your own device-to-device tunnels (site-to-site, or to your own FusionHub) keep running no matter what.

SpeedFusion Connect (SFC) is Peplink’s public, hosted bonding service — shared bonding endpoints in Peplink’s cloud. Any limit, data quota, expiration date, or renewal notice you see applies to your access to that public SFC service — not to SpeedFusion itself. If an SFC plan lapses, SpeedFusion still works; you only lose the public endpoints.

SpeedFusion’s behavior is set by which profile features you enable. Pick per tunnel to match the traffic.

WAN smoothing

WAN smoothing — duplicate packets across links (low ~100%, medium 200%, high 300%, maximum) for lowest-latency resilience.
WAN smoothing — duplicate packets across links (low ~100%, medium 200%, high 300%, maximum) for lowest-latency resilience.

WAN smoothing duplicates packets across links so loss on one path never reaches the application — the lowest-latency, most resilient option (and the most bandwidth-hungry). Levels: low (~100%), medium (200%), high (300%), maximum.

Forward error correction (FEC)

Forward error correction — adaptive (6-20%), low (~13%), or high (~26%) overhead to reconstruct lost packets.
Forward error correction — adaptive (6-20%), low (~13%), or high (~26%) overhead to reconstruct lost packets.

FEC adds parity so lost packets are reconstructed without retransmission. Adaptive uses 6–20% overhead; low ~13%; high ~26%. Great for real-time streams over lossy links.

Hot failover

Hot failover — keep a cellular link hot but out of the tunnel until broadband fails, then cut over sub-second.
Hot failover — keep a cellular link hot but out of the tunnel until broadband fails, then cut over sub-second.

Hot failover keeps a standby link (e.g. cellular) hot but out of the bond until the primary fails, then cuts over sub-second with minimal loss. Set detection to extreme and give the standby WAN a lower priority.

Dynamic weighted bonding & the latency guardrail

Latency differential — cap how far apart WAN latencies may be so a spiking or slow link is dropped from the bond.
Latency differential — cap how far apart WAN latencies may be so a spiking or slow link is dropped from the bond.

Dynamic weighted bonding (DWB) weights each link by real-time quality. The latency differential caps how far apart WAN latencies may be — so a 5G link that spikes to 1300 ms while others sit at 75 ms is simply excluded until it recovers, protecting the bond from a bad circuit. TCP ramp-up accelerates throughput on new sessions. Set the upload bandwidth limit only (the download of one side is the upload of the other).

SpeedFusion Boost (all models)

A per-profile toggle that sustains high throughput across lossy, high-latency links (bonded cellular and LEO satellite / Starlink) by stopping slower links from dragging down faster ones. In field testing a bonded deployment reached 1.46 Gbps over SpeedFusion Boost with bonded Starlink. See Building a SpeedFusion VPN for where the toggle lives.