Is this the right thread for a question about setting priorities for network traffic when there is an Edgerouter Lite in the network?
Don't do this! Especially so since you're on a Gigabit plan. It sounds like offloading is not correctly enabled on your Edgerouter Lite as on my network when my server is uploading backups to Crashplan I don't notice it.
QoS disables offloading and will slow things down, there are other things that will disable Offloading also. Ensure you're using Ethernet where you can, have offloading enabled and have also ensured you're not using any features that disable offloading: https://help.ubnt.com/hc/en-us/articles/115006567467-EdgeRouter-Hardware-Offloading