[Tox Support] transferring large files

[bo0od]

better to search or report this on qtox github:

https://github.com/qTox/qTox/issues

ToBo:
> Hi,
> 
> I tried transferring large files using the tox protocol and got very mixed results. in 90% of the cases the transmission rate was a few dozen kb/s and only in 10% is was as fast as expected. The connection was in all cases a direct P2P connection with UDP (with NAT on one end). No Matter if IPv4 or 6. I used qtox and tuntox.
> 
> I was not able to recognize any pattern in this behavior. Is it a known phenomenon? Is it some kind of limitation of tox?
> 
> 
> ToBo
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