SwarmAgent is randomly not distributing on processing mappings

Development Rendering
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I know others asked the same question ( but no solution),so i thought to make a detailed post of the issue.

Test subject

-3 floor building

  • 1000+ meshes walls and simple assets

  • lightmaps between 64-2048

    Lightmass settings

(Static lighting level scale = .5 or 0.7 )

(Num indirect lightening = 100)

(Num sky lightening bounces = 2)

(Indirect lightening quality = 5)

(indirect lightening smoothness = 1)

(lightmass importance volume scale in the scene (X=40.000000,Y=40.500000,Z=11.153106) )

No lightmass.ini edits.

Build quality ( medium or high )

Light types

RectLight skylight directional light (all set to static)

  • since sky light radiosity is non-Distributable by design and Processing mappings is Distributable
    then all machines in the network should be working on processing mappings
    the issue here is that random machines stay connected to the swarm after finishing sky light radiosity and their cpu usage drops to none and they don’t participate in processing mappings " usually the more powerful machines don’t help with processing mappings"
    Swarm agent coordinator is not on the main machine it is on one of the weak ones.
    there is a huge building time gab while comparing the times when all machines participate and the times only few of them does. so it is safe to say it is not a visual bug which also can be confirmed by the low cpu usage,

Machines CPUs

Machine 1 > ram 32 gb CPU xeon 1660 v1 6 cores 12 threads > usually don’t processing mappings

Machine 2 > ram 32 gb CPU xeon 1660 v1 6 cores 12 threads > usually don’t processing mappings

Machine 3 > ram 16 gb CPU i7-3770 4 cores 8 threads > usually don’t processing mappings

Machine 4 > ram 16 gb cpu i7 6700 hq 4 cores 8 threads laptop > always processing mappings

Machine 5 > ram 32 gb cpu i7 6700 hq 4 cores 8 threads laptop > always processing mappings

Affected ue4 versions (the versions i noticed that in)

4.21 / 4.22

conclusion :
I just wanna know what could cause some machines on the network to simply stay idle instead of processing mappings while stay connected to the swarm network.

Thanks!