2018 Mac Mini and Davinci Resolve Lagging w/ External GPU

I am running Davinci Resolve on my 2018 Mini .. It lags pretty bad through the editing process and just playing the video in general in there. The Mini stats while working in Davinci: It is like neither the mini, nor my external GPU want to take over and fire up to run Davinci better. Also, with the lag for whatever reason it doesnt want to play the sound correctly either. Like it could go for about a full minute without hearing any sound .. not even laggy sound. Not sure if that is from the mini struggling or a davinci/mini issue ...

Now, I know the mini is not realistically designed for video editing, but I got the external GPU to help with this. I figured it could handle it if the GPU took most the load off the mini. It just does not seem to be sharing the load like one would expect.


Here is my current laptop I use as well, it doesnt lag as bad, but still annoying to work with ... Thoughts? Outside building an actual PC or buying a MBP/Studio for editing? Did I expect too much from this setup and the external GPU is just for show and apple hasnt integrated it well enough to actually take advantage of it and make it worth it?