A bunch of us got together to see if it was my computer lagging or if anyone noticed what was causing the issue. We all came to the conclusion that the item frames and or signs in the 2 locations above are the cause for the lag spikes.
Keep in mind my specs: i7 2600k, 24gb ram, GTX 1070 and also keep in mind that I tried multiple different settings, including how many chunks I decided to render.
My suggestion: Limit the amount of signs / item frames near spawn and/or discuss having some (or all) or these signs / item frames removed form these two locations.
If you want to reproduce the problem: Walk in the area of -125 -125 for more than 5 minutes.