Slow internet speed with Site-to-Site VPN

I have 2 RV042 routers, one is version 1 and the other is Version 3 and both have up to date firmware loaded. Both ISPs are cable, one is Comcast and the other is Mediacom. I have set both MTUs to various different settings and set the upload download speeds in Bandwidth Management. Speedtest.net shows speeds at office # 1 of 30/5 and office # 2 is 10/2. The VPN connection is always active. My problem seems to be this, if data is ever being transferred between the offices the internet speed for office #2 slows down to 1.5/.12 but there isn't really any notable differences at office #1. Does anyone have any idea of what could cause the drop in speed.

This makes perfect sense depending on the size of the file. Bandwidth is limited to the speeds you stated, no matter what resource is using them--internet or vpn. Also, a large factor is that with asymmetrical bandwidth that when a lot of upload bandwidth is used, the download bandwidth suffers as well.
I bet most of the time when this happens, the file is being transferred from office #2, thereby using up all the available upload bandwidth.
Office #1 won't see the effects from file transfer because the file transfer is using download bandwidth not upload bandwidth.

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