There a several different factors that be slowing Brightspace down.
- Turn off applications that may use bandwidth or server resources.
- Update OS regularly but not during the time you are working online.
- Update web browsers regularly
- If you have installed web browser plugins, you may need to toggle them on/off.
- Run virus protection, make sure those applications are not running while you are working.
Run a system check https://community.desire2learn.com/d2l/systemCheck