very poor wifi (20 out of 200MB/sec)with vodafone router

[omri]

cable internet. I used to get at least 80 by wifi, with same router

[reneromann]

Sorry, but the WiFi speed is not in any way guaranteed as it mainly depends on your environment - especially if there are many other networks around that are heavily in use.

If you need constant and good speeds, you'll need to switch to a LAN cable.