WAN links drop rate and quality check

Dear Developers ,

Any built-in method in the Peplink software to check the WAN links quality ( Speed , Packet lost , etc ) is really on demand.
many time we are facing with slow performance on load balancing and there is a WAN link not operating smoothly, so we should manually disconnect WAN links one by one and run a download to see which WAN link is not
doing well.
any built-in facility to check the links quality is really appreciated , for example a built-in download manager / speed test utility like the one Peplink has already in the website as an application.

Thanks and Regards.