A good download speed varies by activity and desired quality, so there isn't just one speed that meets all needs. That said, a higher download speed, such as 4 megabytes per second, would likely cover all activities.
Here is a list of the most common activities and their minimum download speed requirements:
- Email - 0.5 Mbps
- Web browsing - 1.5 Mbps
- Streaming HD movies - 4 Mbps
- Video Conferencing - 4 Mbps
- Gaming - 4 Mbps