FYI - Mag256 does not support many new audio codecs. It is an issue. You're only optioin is to contact infomir directly - send them a sample media file and request a firmware update.
Do a speed test using speedtest dot net or similar BUT choose a server closest to your iptv provider. This will give a much better idea of what the bandwidth really is to that geographic location.
If you can't run an ethernet cable then use an Ethernet over powerline adaptor also called Homeplug. ie: tp-link av600 or similar. These will send the ethernet signal over the household electrical wiring and usually give you a more stable connection than WiFi.