Custom Linux is 1000x slower

UPDATE:

I've modified my my Linux image and fixed the issue with the `rtc`, however this did not help the performance!

Some interesting behaviour though, I launch my AOCL kernel multiple times, the first launch has execution times that appear to be in the ideal range of `0 < t < 1000ms`, and all subsequent launches report times of almost exactly `t=1000ms`. This leads me to believe that there is a `1s` clock somewhere that is responsible for the performance hit. My thinking is the first kernel launch could fall anywhere in the clock cycle, and returns on the next edge, hence `0 < t < 1000`, whereas subsequent launches will occur on the clock edge, hence `t=1000ms`.

I also tested the `vector_add` example on my custom image and the prebuilt image (16.1); with my custom image it reports variable kernel time on the order of ` 0 < t < 1000ms` like I was seeing with my kernel. Using the prebuilt image I get consistent performance around `t=8.5ms`.

I would love to hear your thoughts and suggestions! :)