I continue to have no problem with "normal" usage, tryied the 20 firefox tab reloading, it may be that UMTS is slower so the problem does not came out, I did not have the time to test NAT with wifi at higher bitrate.
Hope I will do during the weekend.

Note: I'm using usb to share connection to my laptop, not ad-hoc networking.

Going a bit OT, is there a way to flash the kernel with mtd-utils directly from the device? I'd like to swap kernels even if I do not have my laptop with me.
I hope this is possible so we may workaround the missing fiasco-gen closed binary, his resolution seems to be set for the next milestone, what's the problem to add the binary to the sdk feed just *now*?