No other games have that much stuff going on.
That is really only the case on PvE. I've never experienced saves as long on PvP than I did on PvE. A few seconds at most on the highest populated ones but never as bas as PvE. And the reason is quite obvious; there is no natural cycle on PvE. Once you reach level 24, you are pretty much dominating the game already.
This is not the first time I says it; as long as the E is not more punishing performance on PvE won't improve. If you think that is not accurate, just ask yourself the following question; when was the last time you legitimately lost tames or bases to the environment that were not the result of a bug/grief? Exactly.
Currently PvE is a hoarder mode of farmville, where players just amass hundreds of tames they never uses, build massive bases they fill with those tames because hey, they have pretty colors, etc. Just fly around on any PvE servers and you see massive bases with dozens and sometimes hundreds of tames such as Wyverns that can't even be justified as being bred for mutations.
Now that cryopods are available on all maps, the tame limit should be reduced.
With the tame limit reduced, the amount of structures in range should be lowered (no need massive bases if you don't have ton of tames to house).
Remove the need to have hundreds of tames out for breeding purposes by adding new game mechanic. E.g. as I suggested into another thread:
Only then the save time may improves, but until then, it will just get even worst as long as players continue to hoard and build. Even players that no longer actively plays still reset their bases for the most part. And for the remaining players, they will just bring back even more pretty colored stuff from Genesis to other maps affecting their performance even more as well.