1- Internet conection speed ( 15 mbps is minimal but work, 30 or 50 mbps will be greate) you can use speedtest to verify your Ping (time response in ms, 10 or more ms is a really problem), and you can check there the download speed and upload speed. After the tests, if the problem is your internet provider, call them to improve it.
2- Antivirus could be blocking process (just check notifications or alerts, firewall alerts)
3- Check hard disk space available
4- And finally you can uncheck updates, and only activate its when you are not working or when the internet connectios is free ( nobody in house or your office is using it).