Gravity & Pressure: How Moving Particles Generate More Gravity?

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So, ideal gas under a high pressure produces more gravity because of the pressure components in the stress-energy tensor.

However, high pressure of an ideal gas can be explained as just moving particles. These particles can be quite big and heavy - for example, stars in a galaxy.

I wonder how these views might be consistent. Why moving particles generate more gravity? just because their relativistic mass is bigger?
 
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The stress energy tensor reflects mass,energy and pressure as sources of gravity...and negative pressure as a cause of repulsive gravity...so it's not as simple as the relativistic energy of moving particles...
 

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