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SD-RED 60 slow throughput

Hi all

Im a bit stumped on this one.

Customer has SG330 UTM (siteA), 1gb lease line so 1gb/1gb up and down. Doing speed tests and file downloads off the internet i get what I would expect 930mbps both up and down on the same local network to the UTM.

Another site (siteB) has a 330mb download connection and this one is connected to the UTM via an SD-RED 60. If I plug a laptop into the router at the site, I get approximately 300mbps, its approx because its not a lease line and fluxes a bit. As soon as I plug the laptop via the SD-RED 60, the speed plummets to 30mbps download and 4mpbs upload but its always at 30mbps /  4mbps, it doesnt change.

The red is set as Standard/Unifed during this test, if i set as Standard/Split, the laptop gets 300mbps from the internet.

If i do a file copy from siteA to siteB then it maxes at 30mbps just like the internet

Ive turned off IPS, no difference

QoS disabled

Applied latest firmware

Its cabled at the RED end and no wifi is involved

RED has compression enabled, if disabled the speed drops to approx 26mbps

Web Protection is enabled but have tried disabling it, no difference.

Tried rebooting the UTM, no difference

MTU size on lease line and RED is 1500, have tried 1492, no difference.

Tried two simultaneous downloads from siteB to see if it would do 2 x 30mbps but doesnt, it halves the download speed roughly.

Im now convinced the tunnel can only run at a speed of 30mbps regardless of what RED and its throughput is. If someone would clarify this that would be really helpful

Many thanks



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