PPTP vs L2TP via router

I am a user of the unlimited tariff plan Corbina 10 Mbit / s. At home, there is a wi-fi router ASUS WL-520gc, it distributes the Internet to 3 cars, of which 2 to wi-fi. The problem was that when downloading from torrent networks (legal content), the speed could not get through at 800 Kb / s. The first thing I decided to call those. support The first three “specialists” switched me on within three minutes of a conversation, and as a result I finally got to a person with a very quiet voice. During the 40-minute conversation with breaks for musical breaks, we found the following:

1. According to the tests, the speed does not exceed 375 Kb / s.
2. But, with ftp.yandex.ru, the speed reached 500 Kb / s.
3. I am using PPTP connection type.
4. If you connect directly (without a router), the speed corresponds to the declared tariff.

The conversation ended with a 15 minute wait followed by short beeps.
Sitting without a router was not cool, and I continued to search. Now in google. Walking through the forums, I found several solutions to the problem. People advised to do the following:

1. Disable the Corbina firewall on stat.corbina.ru . The idea seemed to me dubious, I do not understand how blocking ports can affect speed.
2. Delete Kaspersky. As far as I understand this is the most common solution to any problem with any version of Windows. Anyway, I don’t have Kaspersky, so I didn’t follow this step either.
3. Disable wi-fi encryption (I have WPA). It seems to be true, but did not want to sit defenseless (security guards, just do not start). Instead, I checked the speed when connecting to the router via cable. I did not notice any differences from the encrypted wi-fi.
4. Switch from PPTP to L2TP, which is still under testing. Along with the advice was arguing, say, PPTP encryption is implemented in this router not in hardware but in software, which dramatically reduces the exchange rate.

The migration of the router to L2TP took one minute, and, oh, a miracle, the speed went up to 1.2 MB / s!

Conclusion

If you are connected:

1. Through the router.
2. By VPN.

And you have low speed, make sure that the connection type (Connection type in the WAN settings) is L2TP.