NanoVG renderer may be causing performance drop during HUD Gauge rendering

The December 6th nightly, which contains #1475, appears to be when the performance drop in HUD Gauge Render came about. Looking through the 5 other PRs that were merged between the December 1st nightly and then yields not much in the way of anything that might reduce performance. Thus, I'm willing to say that there ***may*** be an issue in our implementation that results in a performance drop.

To make matters worse, not everyone reports a performance increase when using the Dec 1st 2017 nightly or earlier. Thus, there may be hardware dependent problems compound each other in this case.