Extreme Lag/World Load

After the newest upgrade, my screen takes 20-45 seconds to load beyond a certain point.  This happens when I am walking, but more especially when I am flying with my Elytra.   When flying, it will only render 5-60 blocks and stop.  When I make it to the end, I land, wait, and it will then begin to render.  This happens in new areas, and in areas where I have already been. Block Render Stting, I had all the way up to 14, now it is at 7.  The issue did not change.   This happened prior to any updates, however, I was going into extreme territory.  8000+, -, 8000+ Please let me know if there is anything else I can provide.