Reddit User posted:

Currently, the upload bandwidth QC uses is tied directly to your FPS. Meaning QC will congest massive amounts of UPLOAD traffic, potentially leading to people with slow upload speed (below 1 MBps UL, not DL) to heavily lag, warp/teleport & time-out without realizing the actual reason. This could likely be the root cause of current "lag" epidemic. A lot of ISPs provide "asymmetric" services, meaning even though your Internet is "fast", your Upload speed could be much slower than your download and QC needs upload.

If you have ping issues and constant DC/time-out from matches, it could be caused by having a high FPS (leading to massive upload). QC needs ~50 KB/s of upload at +100 FPS. There is currently no option or command to limit Rate, and not having enough bandwidth or hard-limiting the .exe (via Netlimiter, etc.) would disconnect you from matches AND time-out your entire network.

A lot of the current lag and warping issues could be caused by people not being able to keep up with the massive upload QC needs. There is no other game that needs even close to this much upload speed. This needs to be fixed ASAP, as it's making the game literally unplayable at high FPS.
The only workaround right now, is to limit your FPS to 60 (via nVidia Inspector, Resolution Scale, etc.).
You will still need over 30 KB/s of Upload @ 60 FPS, which is WAY more than any other game would ever use.