what speeds do you get when connected to the hub with an ethernet cable?
Appreciate that this isn't particularly relevant because you want decent speeds over wifi, but VM only guarantee speeds when using a cable, so it's worth checking if you're getting the full speed and if it's just a wifi issue. If everything works well when connected via a cable, then your options for improving wifi are pretty limited - generally it comes down to buying your own 3rd party router and using the hub in modem mode..