Made a new age with mystcraft and started my run to explore desert biome + hell biome. figured I could find a lava page outta that style of age, no page.
World seemed quite stable but there was a ton of zombie pigmen and imps running all over the place along with the occasional bombardment from ghasts. I stayed in that world for over 30 minutes there was noticeable lag from flying while exploring.
Returning to the overworld was simple enough, stashed what I brought with me and decided to use the blue crystal blocks I found to upgrade the tower home.
Power armor pickaxe tool was used to tear down old quarried stone walls and then it started getting glitchy, (screen shows quarried stone was cut out from the wall but still unable to move thru that blocks location). Figured more lag or the previous age was still in memory so... just work thru the lag.
Attempted to leave server, d/c r/c, and continue play. nothing. server down

^^
sorry!
Old Ode....

Fixed. Crashed with an out-of-memory error.

Damn it Ode!

Actually the last server my brother tried to test worlds like that to find the diamond worlds that Adam and you had and we, while exploring, caused bad lag cause we were looking for places with pages. So yeah if you explore to much it's basically the server trying to keep in memory basically 20+ Minecraft worlds when it was probably only set up to handle 1-3 (Overworld, Nether, The End)