Vodafone is a very fast network, ranking 3rd in Opensignal's September 2021 report.
On average, you can expect download speeds of 21.6 Mbps and upload speeds of 7.4 Mbps.
However, when it comes to 5G, Vodafone is actually the slowest out of the 4 major networks, with an average download speed of 59 Mbps and average upload speed of 10.8 Mbps.