Acrobat DC appears to limit speed to 10Mbps

We recently migrated from a local file server to a file server that is housed at a remote datacenter. We access the file server that is on the same domain through a IPSEC tunnel. What we have noticed is transferring files with file explorer from the datacenter to the local computer gets around ~20MB/s which is 160Mbps. However, if we open that same PDF from the file server it opens instantly and then proceeds to load the remaining pages.

We have large PDF's (sometimes 300MB+) which is why this is an issue. When opening with Acrobat, we can see the NIC not use more than 10Mbps which is odd. No other program does this.

The fact that Acrobat opens instantly and shows the first page makes me think that Acrobat is reading the headers and first few bytes of data to display it but continues to download in the background using their own code instead of relying on Windows. So far, support says Acrobat isn't throttling but we can clearly see it is. We ruled out security software, tried turning off the fast web view, protected mode, etc.

Is there a way to disable this preload stuff or adjust a setting so it can transfer the data quicker?