These budget settings seemed to help, or I got lucky:

staggeringBudget 128
streamingBudget 5000
streamsDelta 1000

i have not noticed any improvement in 0.9.5.101

As a regular game master, I can say that it is not behaving better.

Hey Geez,

I didn't notice an improvement on the spawning.
The delay happens a little later then before, this is only the case if there is only one GM and the delay is a little less inconsistant. There have been situations where the lag stays away with 4 GM's when no one is spawning anything and other times its there within seconds of a second GM (or one GM) is active.

Overall, I woudn't say the behaviour is better on the current version.

Something that I do notice is that when the delay exists it can happen that both the AI as the players (without GM mode) already see the entities. (spawning a US and FIA force with delay can start a gun fight without us (GM) seeing them)
Also when a GM leaves the game and comes back in the delay can sometimes be gone, this is not consistant and only works 5/10 times. But they do often see the units that are invisible for the other GM.

In T166337#2345059, @ViTalPulse wrote:

Something that I do notice is that when the delay exists it can happen that both the AI as the players (without GM mode) already see the entities. (spawning a US and FIA force with delay can start a gun fight without us (GM) seeing them)
Also when a GM leaves the game and comes back in the delay can sometimes be gone, this is not consistant and only works 5/10 times. But they do often see the units that are invisible for the other GM.

Correct. The server sees the entities immediately - the delay is on sending them to connected clients.

In T166337#2345020, @Geez wrote:

Hello bacon_8008.
Is the behaviour better on the current version?
Regards,
Geez

Unfortunately, no :(

Currently the only way to get around this delay is to use streaming budget values at least as large as in my comment above.

Thank you for the info.
The fix is prepared internally and the fix will appear in one of the larger future updates.
Regards,
Geez

A small clarification - the fix didn't make it in time for the next week's patch. However, the patch after it is going to contain it.
Thank you for your report and sorry for the delay, guys.

Was the fix for this pushed out in 0.9.5.116?

This is still occurring? so where is the promised patch?

I've noticed in current version this tends to happen when there are more than a few GMs present. I've also been told that my things are visible for non-GM players much earlier than they start to get visible for me.