Hi Machtl,
Just a few thoughts after reading your post.
It can take quite a bit of time running PepVPN tests to find the right combination in settings for the best SpeedFusion performance.
Bonding WANs with different characteristics makes it even more difficult and doesn’t always mean you see an increased performance.
In these occasions you could be better of using some WANs in priority 2.
Run several PepVPN tests with Remote connections enabled and use different combinations of local and remote WANs to find out what works best for your situation.
Using SIM cards from different cellular providers usually works better than using SIMcards from the same provider.
Don’t be alarmed by seeing the CPU go up to 100%. As long as it is briefly. You see that quite regularly when a change is made.
We don’t use WAN smoothing and FEC at the same time.
You could try disabling WAN smoothing and configuring FEC to high instead.
You can find some more info on FEC in this forum post . It is worth watching the video.
And make sure you configure the up and download speeds of the WAN connection. ( set it to 80% of the actual speeds).
The router uses those values when the WAN is used.
Hope that helps!