I work from home right now and have a pretty decent little network for my office (for both me and my wife), we used AVG's VPN, and while it does the job, it def slows my web connection down like Buttfart said (and we have a business line).
Having said, I just paid into Google One (mainly for storage), but Google has a VPN that works beautifully. I can barely tell a difference (it's slight, but not annoyingly so).
FWIW, I up/download at least a gig of data to and from work a day, but often times way more (big db files and RAW photos, uncut video).